2,5-DKG permeases

ABSTRACT

The invention provides isolated nucleic acid molecules encoding polypeptides having 2,5-DKG permease activity, and oligonucleotides therefrom. The isolated nucleic acid molecules can be expressed in appropriate bacterial cells to enhance the production of 2-KLG, which can subsequently be converted to ascorbic acid. Further provided are isolated polypeptides having 2,5-DKG permease activity, immunogenic peptides therefrom, and antibodies specific therefor. The invention also provides methods of identifying novel 2,5-DKG permeases.

This application claims the benefit of U.S. Provisional Application No. 60/325,774, filed Aug. 4, 2000, which was converted from U.S. Ser. No. 09/633,294, and U.S. Provisional Application No. 60/421,141, filed Sep. 29, 2000, which was converted from U.S. Ser. No. 09/677,032, each of which is incorporated herein by reference in its entirety.

This invention was made in part with U.S. Government support under Cooperative Agreement 70NANB5H1138 and ATP NIST project Identification Number 1995-05-0007E. The U.S. Government has certain rights in this invention.

BACKGROUND OF THE INVENTION FIELD OF THE INVENTION

The present invention relates generally to microbial transporter proteins and, more specifically, to novel 2,5-diketo-D-gluconic acid (2,5-DKG) permeases.

BACKGROUND INFORMATION

Adequate intake of ascorbic acid, or vitamin C, is recognized as an important factor in maintaining health. To ensure adequate intake of ascorbic acid, the chemical is now added to many foods, drinks and cosmetic products, and is also sold as a direct vitamin supplement. To meet the commercial demand for ascorbic acid, there is a need to develop more efficient processes for its production.

Although there are a number of alternative methods of producing ascorbic acid, one of the least expensive and most ecologically sound methods is biofermentation. Bacterial strains have now been engineered to express all of the enzymes required for the stepwise conversion of an inexpensive sugar source, such as D-glucose, to a stable precursor of ascorbic acid, 2-keto-L-gulonic acid (2-KLG) (see U.S. Pat. No. 5,032,514 and references therein). 2-KLG can be readily converted to ascorbic acid by chemical or enzymatic procedures.

FIG. 2 shows schematically the enzymatic reactions that take place in the bioconversion of D-glucose to 2-KLG. As shown in FIG. 2, the enzymatic reactions that lead from D-glucose, to D-gluconic acid, to 2-keto-D-gluconic acid (2-KDG), to 2,5-diketo-D-gluconic acid (2,5-DKG), take place at the surface of the bacterial cell. 2,5-DKG must then enter the cell in order for its enzymatic conversion to 2-KLG.

Much effort has been expended in increasing the efficiency of the enzymatic reactions involved in 2-KLG production. For example, U.S. Pat. No. 5,032,514 describes methods for increasing 2-KLG production by reducing metabolic diversion of 2,5-DKG to products other than 2-KLG.

Increasing uptake of 2,5-DKG by a bacterial strain suitable for biofermentation could be advantageous in increasing 2-KLG production. Expressing additional copies of an endogenous 2,5-DKG permease, or expressing an exogenous 2,5-DKG permease with superior properties, could increase uptake of 2,5-DKG. However, to date, no 2,5-DKG permease has been identified or characterized that could be used in this manner.

Therefore, there exists a need to identify and characterize nucleic acid molecules encoding 2,5-DKG permeases, so that permeases with advantageous properties can be used in the commercial production of ascorbic acid and in other important applications. The present invention satisfies this need and provides related advantages as well.

SUMMARY OF THE INVENTION

The invention provides an isolated nucleic acid molecule encoding a polypeptide which has 2,5-DKG permease activity. In one embodiment, the isolated nucleic acid molecule contains a nucleotide sequence having at least 40% identity to a nucleotide sequence selected from the group consisting of SEQ ID NOS:1, 3, 5, 7, 9 and 11. In another embodiment, the isolated nucleic acid molecule contains a nucleotide sequence which encodes a polypeptide having at least 40% identity to an amino acid sequence selected from the group consisting of SEQ ID NOS:2, 4, 6, 8, 10 and 12.

Also provided are vectors and cells containing isolated nucleic acid molecules encoding polypeptides having 2,5-KDG permease activity. In one embodiment, the cells are bacterial cells selected from the genera Pantoea and Klebsiella.

The invention also provides methods of identifying and isolating nucleic acid molecules encoding polypeptides which have 2,5-DKG permease activity. Also provided are methods of enhancing 2-KLG production, by expressing the nucleic acid molecules of the invention in suitable bacterial cells.

Further provided are isolated polypeptides having 2,5-DKG permease activity, and immunogenic peptides therefrom. The invention also provides antibodies specific for such polypeptides and peptides.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A and 1B shows an alignment of the amino acid sequences of the 2,5-DKG permeases designated YiaX2 (SEQ ID NO:12); PE1 (SEQ ID NO:2); PE6 (SEQ ID NO:4); prmA (SEQ ID NO:8); prmB (SEQ ID NO:10) and PK1 (SEQ ID NO:6).

FIG. 2 shows the biosynthetic pathway from glucose to 2-KLG in a bacterial strain suitable for biofermentation.

FIG. 3 shows the metabolic selection strategy used to identify novel 2,5-DKG permeases.

DETAILED DESCRIPTION OF THE INVENTION

The invention provides novel nucleic acid molecules encoding polypeptides having 2,5-DKG permease activity, and related products and methods. The molecules of the invention can advantageously be used to increase the efficiency of 2-KLG bioproduction, and thus to lower the cost of commercial ascorbic acid production.

Naturally occurring 2,5-DKG permeases are polypeptides localized to the cytoplasmic membrane of microorganisms, which are predicted, using commercially available topology prediction programs, to contain about 10 to 12 transmembrane domains. Each transmembrane spanning segment is about 20 amino acids in length, with the intracellular and extracellular loops ranging from about 2 to about 83 amino acids in length. Generally, the loop between the fifth and sixth transmembrane domain spanning segments is larger than the other loops.

Naturally occurring 2,5-DKG permeases are typically about 350-550 amino acids in length, such as about 400-450 amino acids in length, and particularly about 425-440 amino acids in length.

The nucleotide sequences encoding six exemplary 2,5-DKG permeases are set forth as follows, with the designation and organismal source of the molecule indicated in parentheses: SEQ ID NO:1 (PE1 from an environmental source); SEQ ID NO:3 (PE6 from an environmental source); SEQ ID NO:5 (PK1 from Klebsiella oxytoca); SEQ ID NO:7 (prmA from Pantoea citrea); SEQ ID NO:9 (prmB from Pantoea citrea); and SEQ ID NO:11 (YiaX2 from Klebsiella oxytoca). The corresponding encoded 2,5-DKG permease amino acid sequences are set forth as SEQ ID NO:2 (PE1); SEQ ID NO:4 (PE6); SEQ ID NO:6 (PK1); SEQ ID NO:8 (prmA); SEQ ID NO:10 (prmB); and SEQ ID NO:12 (YiaX2).

2,5-DKG permeases from different microorganisms exhibit extensive amino acid sequence relatedness over their entire length, as is evidenced by the six-way sequence alignment shown in FIG. 1. The overall identity of the six permeases shown in FIG. 1 is about 17%, and the overall similarity, taking into account conservative substitutions, is about 43%.

Based on their predicted topological and sequence similarity, 2,5-DKG permeases disclosed herein can be further subdivided into two structural families. The three 2,5-DKG permeases designated YiaX2, PE6 and PrmA are representative of one family of permeases, sharing about 50% overall identity in a three-way amino acid sequence alignment. The three 2,5-DKG permeases designated PK1, PE1 and PrmB are representative of a second family of related permeases, sharing about 60% overall identity in a three-way amino acid sequence alignment.

Naturally occurring 2,5-DKG permeases also exhibit 2,5-DKG permease activity. The term “2,5-DKG permease activity,” as used herein, refers to the ability of the polypeptide, when expressed in its native orientation at the cell membrane, to transport 2,5-DKG across the cytoplasmic membrane, in comparison with an unrelated control polypeptide. Such transport can be either unidirectional or bidirectional.

2,5-DKG permease activity can be determined by a variety of methods. For example, 2,5-DKG permease activity can be determined using a metabolic selection assay, as described further in the Example, below. Briefly, a bacterial cell either naturally deficient in 2,5-DKG permease activity, or made deficient in 2,5-DKG permease activity, is identified or produced. As described in the Example, bacterial cells can be made deficient in endogenous 2,5-DKG permease activity by preparing a deletion mutant of one or more endogenous 2,5-DKG permease genes, using the polymerase chain reaction, following methods known in the art. The term “deficient,” as used in relation to a cell deficient in 2,5-DKG permease activity, is intended to refer to endogenous 2,5-DKG permease activity that is comparable to, or less than, the endogenous permease activity of a K. oxytoca strain deleted in the yiaX2 gene, such as the strain K. oxytoca ΔyiaX2 [tkr idnO], as assessed either by a growth assay or by a 2,5-DKG uptake assay.

A cell useful in a metabolic selection assay to determine 2,5-DKG permease activity of an expressed polypeptide can further naturally be capable of converting intracellular 2,5-DKG to carbon and energy, or made capable of such conversion by recombinant expression of appropriate metabolic enzymes. As described in the Example, a combination of nucleic acid molecules encoding a 2-keto-reductase (tkr) and a 5-keto-reductase (idnO), from any bacterial species, can be expressed in the cell, which together provide the cell with the ability to catalyze the reduction of 2,5-DKG to gluconic acid. Gluconic acid can then be used by the cell as a carbon and energy source that supports cell growth.

An exemplary bacterial cell suitable for metabolic assays to determine 2,5-DKG permease activity is the strain K. oxytoca ΔyiaX2 [tkr idnO] shown in FIG. 3 and described in the Example, below. This strain has a deleted yiaX2 2,5-DKG permease gene, and also recombinantly expresses the tkr/idnD/idnO operon set forth as SEQ ID NO:13 on a high copy number plasmid. Within SEQ ID NO:13, nucleotides 292-1236 encode a 2-keto-reductase (tkr) (SEQ ID NO:14); nucleotides 1252-2280 encode an idonic acid dehydrogenase (idnd) (SEQ ID NO:15); and nucleotides 2293-3045 encode a 5-keto-reductase (idnO) (SEQ ID NO:16). Alternatively, nucleic acid molecules encoding polypeptides which contain modifications from the amino acid sequences designated SEQ ID NO:14 or 16, but which retain 2-keto-reductase activity or 5-keto-reductase activity, respectively, can be used in metabolic assays. Exemplary amino acid sequences have at least 60%, such as at least 70%, preferably 80%, 90%, 95% or greater identity to SEQ ID NOS:14 or 16, respectively.

The ability of such a bacterial cell to grow on medium containing 2,5-DKG as the sole carbon source, upon expression of a candidate 2,5-DKG permease, is a measure of the ability of the expressed permease to transport 2,5-DKG into the cell, and is thus a measure of its 2,5-DKG permease activity. Each of SEQ ID NOS:2, 4, 6, 8, 10 and 12 was demonstrated to have 2,5-DKG permease activity, as evidenced by the ability of K. oxytoca ΔyiaX2 [tkr idnO] expressing each permease to grow on 2,5-DKG as the sole carbon source.

Likewise, 2,5-DKG permease activity can be determined by measuring uptake of labeled or unlabeled 2,5-DKG. For example, 2,5-DKG can be detectably labeled, such as with a fluorescent or radioactive tag. The ability of a cell or membrane vesicle expressing a 2,5-DKG permease to take up the detectable label when provided with detectably labeled 2,5-DKG, can be determined using detection assays specific for the particular label, which are well known in the art. Likewise, uptake of unlabeled 2,5-DKG can be measured by HPLC or other sensitive detection assay known in the art. Uptake of 2,5-DKG is thus a measure of permease activity. Each of SEQ ID NOS:2, 4, 6, 8, 10 and 12 exhibits 2,5-DKG permease activity as determined by assay of uptake of radiolabeled 2,5-DKG by bacterial cells expressing the recombinant permeases.

Additionally, 2,5-DKG permease activity can be measured in any cell in which 2,5-DKG can be converted to a product, by measuring production of the product in the presence of extracellular 2,5-DKG. For example, in a cell naturally expressing, or recombinantly expressing, a 2,5-DKG reductase, intracellular 2,5-DKG is converted to 2-KLG. The ability of the bacterial cell to produce 2-KLG when provided with extracellular 2,5-DKG, upon expression of a 2,5-DKG permease, is a measure of the ability of the expressed permease to transport 2,5-DKG into the cell, and is thus a measure of its 2,5-DKG permease activity. Intracellular 2-KLG can be detected, for example, using HPLC or other sensitive detection methods known in the art. Other metabolic products of 2,5-DKG can also be detected, by similar methods.

It will be appreciated that a variety of alternative assays can be used to determine 2,5-DKG permease activity. For instance, the change in pH across a cell or vesicle membrane as 2,5-DKG, an acid, is transported across the membrane can be detected. Similarly, a decrease over time in extracellular 2,5-DKG can be determined.

Accordingly, using any of the activity assays described herein, those skilled in the art can distinguish between a polypeptide having 2,5-DKG permease activity, and a polypeptide not having such activity.

A 2,5-DKG permease of the invention can selectively transport 2,5-DKG. As used herein in relation to transport activity, the term “selective” refers to preferential transport of 2,5-DKG rather than 2-KLG into or out of the cell. A permease that selectively transports 2,5-DKG will transport 2,5-DKG at least 2-fold, such as at least 5-fold, including greater than 10-fold more efficiently than it transports 2-KLG. A permease that selectively transports 2,5-DKG is particularly advantageous in applications where it is desirable to increase intracellular production of 2-KLG, such as in the commercial production of ascorbic acid. In particular, employing a permease that selectively transports 2,5-DKG prevents intracellular 2-KLG from competing with extracellular 2,5-DKG for permease-mediated transport through the membrane, and increases the overall efficiency of intracellular 2-KLG production.

It will be appreciated that the assays described above for determining 2,5-DKG permease activity can be modified to simultaneously, or separately, determine 2-KLG permease activity. For example, a metabolic assay can be designed in which a bacterial cell can convert either intracellular 2,5-DKG or 2-KLG to carbon and energy. In such a cell, the relative ability of the cell to grow on 2,5-DKG as the sole carbon source, compared with its ability to grow on 2-KLG as the sole carbon source, is a measure of the ability of the expressed permease to selectively transport 2,5-DKG. Using such an assay, it was determined that the 2,5-DKG permeases designated YiaX2, PE1, PE6, prmA and prmB are non-selective for 2,5-DKG, as they also efficiently catalyze the transport of 2-KLG, as K. oxytoca ΔyiaX2 [tkr idnO] cells expressing such permeases grow well on either 2,5-DKG or 2-KLG. In contrast, PK1 selectively transports 2,5-DKG, and K. oxytoca ΔyiaX2 [tkr idnO] cells expressing PK1 (SEQ ID NO:6) grow on 2,5-DKG but not on 2-KLG as the sole carbon source.

The invention provides an isolated nucleic acid molecule encoding a polypeptide which has 2,5-DKG permease activity. The invention nucleic acid molecules of the invention are suitable for a variety of commercial and research applications. For example, one or more of the invention nucleic acid molecules can be expressed in bacterial cells in order to enhance the rate of uptake of 2,5-DKG by the cells. Enhancing uptake of 2,5-DKG has a variety of applications, such as in commercial production of 2,5-DKG itself, or commercial production of any metabolic product of 2,5-DKG. For example, 2,5-DKG uptake is a rate limiting step in the biosynthesis of 2-KLG, which is a stable intermediate in the synthesis of ascorbic acid. 2-KLG can thus be obtained from bacterial cells expressing 2,5-DKG permeases, and converted to ascorbic acid.

Additionally, the invention nucleic acid molecules can be used as probes or primers to identify and isolate 2,5-DKG permease homologs from additional species, or as templates for the production of mutant permeases, using methods known in the art and described further below. Such permeases can have advantageous properties compared with the 2,5-DKG permeases disclosed herein as SEQ ID NOS:2, 4, 6, 8, 10 and 12, such as greater enzymatic activity or greater 2,5-DKG selectivity.

In one embodiment, an isolated nucleic acid molecule of the invention is not completely contained within the nucleotide sequence designated SEQ ID NO:19 of WO 00/22170, which is the K. oxytoca yia operon. In another embodiment, the isolated nucleic acid molecule of the invention is not completely contained within the nucleotide sequence herein designated SEQ ID NO:11. In another embodiment, the encoded polypeptide is not completely contained within the amino acid sequence herein designated SEQ ID NO:12.

The term “isolated,” as used herein, is intended to mean that the molecule is altered, by the hand of man, from how it is found in its natural environment. For example, an isolated nucleic acid molecule can be a molecule operatively linked to an exogenous nucleic acid sequence. An isolated nucleic acid molecule can also be a molecule removed from some or all of its normal flanking nucleic acid sequences, such as removed from one or more other genes within the operon in which the nucleic acid molecule is normally found.

Specifically with respect to an isolated nucleic acid molecule containing the nucleotide sequence designated SEQ ID NO:11, or encoding the yiaX2 polypeptide designated SEQ ID NO:12, the term “isolated” is intended to mean that the nucleic acid molecule does not contain any of the flanking open reading frames (orfs) present in the K. oxytoca yia operon, such as the orfs designated lyxK and orf1, described in WO 00/22170.

An isolated molecule can alternatively, or additionally, be a “substantially pure” molecule, in that the molecule is at least 60%, 70%, 80%, 90 or 95% free from cellular components with which it is naturally associated. An isolated nucleic acid molecule can be in any form, such as in a buffered solution, a suspension, a heterologous cell, a lyophilized powder, or attached to a solid support.

The term “nucleic acid molecule” as used herein refers to a polynucleotide of natural or synthetic origin. A nucleic acid molecule can be single- or double-stranded genomic DNA, cDNA or RNA, and represent either the sense or antisense strand or both. A nucleic acid molecule can thus correspond to the recited sequence, to its complement, or both.

The term “nucleic acid molecule” is intended to include nucleic acid molecules that contain one or more non-natural nucleotides, such as nucleotides having modifications to the base, the sugar, or the phosphate portion, or having one or more non-natural linkages, such as hosphothioate linkages. Such modifications can be advantageous in increasing the stability of the nucleic acid molecule, particularly when used in hybridization applications.

Furthermore, the term “nucleic acid molecule” is intended to include nucleic acid molecules modified to contain a detectable moiety, such as a radiolabel, a fluorochrome, a ferromagnetic substance, a luminescent tag or a detectable binding agent such as biotin. Nucleic acid molecules containing such moieties are useful as probes for detecting the presence or expression of a 2,5-DKG permease nucleic acid molecule.

In one embodiment, the isolated nucleic acid molecule encoding a polypeptide which has 2,5-DKG permease activity contains a nucleotide sequence comprising nucleotides 1-20, 1-100, 101-120, 101-200, 201-220, 201-300, 301-320, 301-400, 401-420, 401-500, 501-520, 501-600, 601-620, 601-700, 701-720, 701-800, 801-820, 801-900, 901-920, 901-1000, 1001-1020, 1001-1100, 1101-1120, 1100-1200, 1201-1220, 1201-1300, 1301-1320, 1301-1400, 1401-1420 or 1401-1500 of any of SEQ ID NOS:1, 3, 5, 7, 9 or 11.

In another embodiment, the isolated nucleic acid molecule encoding a polypeptide which has 2,5-DKG permease activity encodes an amino acid sequence comprising amino acids 1-10, 1-50, 51-60, 51-100, 101-110, 101-150, 151-160, 151-200, 201-210, 201-250, 251-260, 251-300, 301-310, 301-350, 351-361, 351-400, 401-410 or 401-439 of any of SEQ ID NOS:2, 4, 6, 8, 10 or 12.

In one embodiment, the isolated nucleic acid molecule encoding a polypeptide which has 2,5-DKG permease activity contains a nucleotide sequence having at least 35% identity to any of the 2,5-DKG permease nucleic acid molecules designated SEQ ID NOS:1, 3, 5, 7, 9 or 11. Preferably, such a molecule will have at least 40% identity to any of these recited SEQ ID NOS, such as at least 45%, 50%, 60%, 70% or 80% identity, including at least 90%, 95%, 98%, 99% or greater identity to SEQ ID NOS:1, 3, 5, 7, 9 or 11.

In another embodiment, the isolated nucleic acid molecule encoding a polypeptide which has 2,5-DKG permease activity contains a nucleotide sequence which encodes a polypeptide having at least 35% identity to any of the 2,5-DKG permease polypeptides designated SEQ ID NOS:2, 4, 6, 8, 10 or 12. Preferably, the encoded polypeptide will have at least 40% identity to any of these recited SEQ ID NOS, such as at least 45%, 50%, 60%, 70%, 80% identity, including at least 90%, 95%, 98%, 99% or greater identity to SEQ ID NOS:2, 4, 6, 8, 10 or 12.

The term “percent identity” with respect to a nucleic acid molecule or polypeptide of the invention is intended to refer to the number of identical nucleotide or amino acid residues between the aligned portions of two sequences, expressed as a percent of the total number of aligned residues, as determined by comparing the entire sequences using a CLUSTAL V computer alignment and default parameters. CLUSTAL V alignments are described in Higgens, Methods Mol. Biol. 25:307-318 (1994), and an exemplary CLUSTAL V alignment of 2,5-DKG permease amino acid sequences is presented in FIG. 1.

Due to the degeneracy of the genetic code, the nucleotide sequence of a native nucleic acid molecule can be modified and still encode an identical or substantially similar polypeptide. Thus, degenerate variants of SEQ ID NOS:1, 3, 5, 7, 9 or 11 are exemplary invention nucleic acid molecules encoding polypeptides having 2,5-DKG permease activity.

Additionally, nucleic acid molecules encoding 2,5-DKG permeases from other species of microorganisms are exemplary invention nucleic acid molecules. The six permeases designated YiaX2, PE1, PE6, prmA, prmB and PK1, which were isolated from at least three, and likely four, different species of microorganisms, share substantial nucleotide sequence identity. For example, the two most similar of the disclosed 2,5-DKG permease nucleotide sequences, SEQ ID NO:5 (PK1) and SEQ ID NO:1 (PE1), share 86% identity across their length. The two most dissimilar of the disclosed 2,5-DKG permease nucleotide sequences, SEQ ID NO:7 (prma) and SEQ ID NO:9 (prmB), share 51% identity across their length. In contrast, a search of GenBank reveals no other nucleotide sequences, including sequences which encode transporter proteins and other transmembrane proteins, that exhibit significant identity or similarity to any of the disclosed 2,5-DKG permease nucleotide sequences over the entire length of their sequences.

The six permeases disclosed herein also share substantial amino acid sequence identity over their entire length, as described previously. For example, PK1 from Klebsiella oxytoca (SEQ ID NO:6), and PE1, from an environmental source (SEQ ID NO:2), are 93% identical at the amino acid level. The amino acid sequence in the GenBank database most closely related to a 2,5-DKG permease, which is a putative tartrate transporter from Agrobacterium vitis (GenBank Accession U32375 or U25634) is 33% identical to SEQ ID NO:12 (YiaX2), and shares less identity with the other disclosed 2,5-DKG permeases. Other sequences with some degree of identity in the GenBank database to the disclosed 2,5-DKG permease include membrane transporter proteins from a variety of species, including phthalate transporter proteins from B. cepacia (AF152094) and P. putida (D13229); hydroxyphenylacetate transporters from S. dublin (AF144422) and E. coli (Z37980); and probable transporter proteins from S. coelicolor (AL136503 and AL132991) each of which has about 27% or less identity at the amino acid level to the recited SEQ ID NOS.

In view of the high degree of identity between different 2,5-DKG permease nucleic acid molecules and encoded polypeptides within a single species and between different microbial species, additional 2,5-DKG permeases from other species can be readily identified and tested. Thus, nucleic acid molecules of the invention include nucleic acid molecules that encode polypeptides having 2,5-DKG permease activity from any microbial species. Microorganisms that contain 2,5-DKG permeases can be recognized by their ability to actively transport 2,5-DKG, such that they can grow on 2,5-DKG as the sole carbon source, or incorporate 2,5-DKG in an uptake assay. Such microorganisms can include, for example, bacteria, including Archaebacteria, gram positive and gram negative bacteria; yeast; and fungi.

Exemplary bacteria which contain 2,5-DKG permeases include Proteobacteria, and more specifically Enterobacteria and Pseudomonads (e.g. P. aeruginosa), as described in the Example. Exemplary Enterobacteria include species from the genera Klebsiella (e.g. K. oxytoca, from which SEQ ID NOS:5 and 11 were obtained) and Pantoea (e.g. P. citrea, from which SEQ ID NOS:7 and 9 were obtained, and P. agglomerans). Sources of such microorganisms include public repositories, such as the American Type Culture Collection (ATCC), and commercial sources. It will be appreciated that the taxonomy and nomenclature of bacterial genera are such that the same or similar strains are sometimes reported in the literature as having different names. For example, Klebsiella oxytoca (e.g. ATCC 13182) has alternatively been described as Aerobacter aerogenes, Klebsiella aerogenes and Klebsiella pneumoniae. Likewise, Pantoea agglomerans (e.g. ATCC 21998) has alternatively been described as Erwinia herbicola and Acetomonas albosesamae. The terms “Klebsiella” and “Pantoea,” as used herein, are intended to refer to the genera of the strains deposited as ATCC 13182 and 21998, respectively.

Additionally, microorganisms from which 2,5-DKG permease nucleic acid molecules can be obtained are microorganisms present in environmental samples. For example, the 2,5-DKG permease nucleic acid molecules designated SEQ ID NOS:1 and 3 were obtained from environmental samples. As used herein, the term “environmental sample” refers to a sample obtained from natural or man-made environments, which generally contains a mixture of microorganisms.

Exemplary environmental samples are samples of soil, sand, freshwater or freshwater sediments, marine water or marine water sediments, industrial effluents, hot springs, thermal vents, and the like. Within an environmental sample there are likely to be microorganisms that are unidentified, and also microorganisms that are uncultivable. Isolation of invention 2,5-DKG permease molecules of the invention from microorganisms present in environmental samples does not require either identification or culturing of the microorganism.

Furthermore, nucleic acid molecules of the invention include nucleic acid molecules encoding amino acid sequences that are modified by one or more amino acid additions, deletions or substitutions with respect to the native sequence of SEQ ID NOS:2, 4, 6, 8, 10 or 12. Such modifications can be advantageous, for example, in enhancing the stability, expression level, enzymatic activity, or 2,5-DKG selectivity of the permease. If desired, such modifications can be randomly generated, such as by chemical mutagenesis, or directed, such as by site-directed mutagenesis of a native permease sequence, using methods well known in the art.

An amino acid sequence that is modified from a native permease amino acid sequence can include one or more conservative amino acid substitutions, such as substitution of an apolar amino acid with another apolar amino acid (such as replacement of leucine with an isoleucine, valine, alanine, praline, tryptophan, phenylalanine or methionine); substitution of a charged amino acid with a similarly charged amino acid (such as replacement of a glutamic acid with an aspartic acid, or replacement of an arginine with a lysine or histidine); or substitution of an uncharged polar amino acid with another uncharged polar amino acid (such as replacement of a serine with a glycine, threonine, tyrosine, cysteine, asparagine or glutamine). A modified amino acid sequence can also include one or more nonconservative substitutions without adversely affecting the desired biological activity.

Computer programs known in the art can provide guidance in determining which amino acid residues can be substituted without abolishing the enzymatic activity of a 2,5-DKG permease (see, for example, Eroshkin et al., Comput. Appl. Biosci. 9:491-497 (1993)).

Additionally, guidance in modifying amino acid sequences while retaining or enhancing functional activity is provided by aligning homologous 2,5-DKG permease polypeptides from various species (see FIG. 1). It is well known in the art that evolutionarily conserved amino acid residues and domains are more likely to be important for maintaining biological activity than less well-conserved residues and domains. Thus, it would be expected that substituting a residue which is highly conserved among the six 2,5-DKG permeases shown in FIG. 1 (or among the members of the two structural families of permeases, defined as SEQ ID NOS:2, 6 and 10, and SEQ ID NOS:4, 8 and 12) with a non-conserved residue may be deleterious, whereas making the same substitution at a residue which varies widely among the different permeases would likely not have a significant effect on biological activity.

A comparison of the amino acid sequences of PE1(SEQ ID NO:2), which transports both 2,5-DKG and 2-KLG, and PK1 (SEQ ID NO:6), which selectively transports 2,5-DKG, indicates that the regions responsible for 2,5-DKG selectivity must reside in the 7% of amino acids which differ between these two sequences. Therefore, modifying all or some of these differing residues in a 2,5-DKG permease to those found in the PK1 sequence would be expected to increase 2,5-DKG selectivity of the permease.

Alignment of the six 2,5-DKG permeases described herein also provides guidance as to regions where additions and deletions are likely to be tolerated. For example the N and C termini, and the region around amino acids 225-250 (based on the numbering of SEQ ID NO:12 (yiaX2)) appear to be regions that are relatively tolerant of amino acid insertions and deletions, as evidenced by gaps in the sequence alignment. Modified 2,5-DKG permeases can thus include “tag” sequences at such sites, such as epitope tags, histidine tags, glutathione-S-transferase (GST) and the like, or sorting sequences. Such additional sequences can be used, for example, to facilitate purification or characterization of a recombinant 2,5-DKG permease.

It will be appreciated that confirmation that any particular nucleic acid molecule is a nucleic acid molecule of the invention can be obtained by determining the 2,5-DKG permease activity of the encoded polypeptide, using one or more of the functional assays described herein.

The invention further provides an isolated nucleic acid molecule encoding a polypeptide which has 2,5-DKG permease activity, wherein the nucleic acid molecule is operatively linked to a promoter of gene expression. The term “operatively linked,” as used herein, is intended to mean that the nucleic acid molecule is positioned with respect to either the endogenous promoter, or a heterologous promoter, in such a manner that the promoter will direct the transcription of RNA using the nucleic acid molecule as a template.

Methods for operatively linking a nucleic acid to a desired promoter are well known in the art and include, for example, cloning the nucleic acid into a vector containing the desired promoter, or appending the promoter to a nucleic acid sequence using PCR. A nucleic acid molecule operatively linked to a promoter of RNA transcription can be used to express 2,5-DKG transcripts and polypeptides in a desired host cell or in vitro transcription-translation system.

The choice of promoter to operatively link to an invention nucleic acid molecule will depend on the intended application, and can be determined by those skilled in the art. For example, if a particular gene product may be detrimental to a particular host cell, it may be desirable to link the invention nucleic acid molecule to a regulated promoter, such that gene expression can be turned on or off. An exemplary inducible promoter known in the art is the lacPO promoter/operator, which is repressed by the lacI^(q) gene product provided by certain host cells, and induced in the presence of 0.01 to 1 mM IPTG (see Example, below). For other applications, weak or strong constitutive promoters may be preferred.

The invention further provides a vector containing an isolated nucleic acid molecule encoding a polypeptide which has 2,5-DKG permease activity. The vectors of the invention will generally contain elements such as a bacterial origin of replication, one or more selectable markers, and one or more multiple cloning sites. The choice of particular elements to include in a vector will depend on factors such as the intended host cell or cells; whether expression of the inserted sequence is desired; the desired copy number of the vector; the desired selection system, and the like. The factors involved in ensuring compatibility between a host and a vector for different applications are well known in the art.

In applications in which the vectors will be used for recombinant expression of the encoded polypeptide, the isolated nucleic acid molecules will generally be operatively linked to a promoter of gene expression, as described above, which may be present in the vector or in the inserted nucleic acid molecule. In cloning and subcloning applications, however, promoter elements need not be present.

An exemplary vector suitable for both cloning applications and for expressing 2,5-DKG permeases in different bacterial species is the low copy number plasmid pCL1920 described by Lerner et al., Nucleic Acids Res. 18:4621 (1994), which contains a spectinomycin resistance gene (see Example, below).

Also provided are cells containing an isolated nucleic acid molecule encoding a polypeptide which has 2,5-DKG permease activity. The isolated nucleic acid molecule will generally be contained within a vector compatible with replication in the particular host cell. However, for certain applications, incorporation of the nucleic acid molecule into the bacterial genome will be preferable.

The cells of the invention can be any cells in which a 2,5-DKG permease will be expressed and folded into an active conformation. Guidance in choosing appropriate host cells is provided by identifying cell types which express other functional 10 to 12 transmembrane transporter proteins. For example, 10 to 12 transmembrane transporter proteins are found in a variety of bacterial species, as well as in yeast (e.g. S. pombe), Arabidopsis, and Drosophila. Therefore, depending on the particular application for the host cell, a host cell of the invention can be a bacterial cell, yeast, Arabidopsis or Drosophila cell.

In a preferred embodiment, the cell is a bacterial cell. The choice of bacterial cell will depend on the intended application. For example, for routine subcloning applications, the cell can be any convenient laboratory strain of bacteria, such as E. coli, which can be transformed with the isolated nucleic acid molecules and vectors of the invention by methods well known in the art.

For assessment of encoded 2,5-DKG permease activity, the cell can be a bacterial strain suitable for metabolic assays, such as a strain which endogenously expresses, or which is engineered to express, enzymes that catalyze the conversion of 2,5-DKG to essential products. An exemplary strain suitable for metabolic assays is the K. oxytoca ΔyiaX2 [tkr idnO] strain designated MGK002 [pDF33] described further in the Example, below, which provides for the conversion of intracellular 2,5-DKG to gluconic acid, which can be used as a carbon and energy source.

For use in the commercial bioproduction of 2,5-DKG metabolites, the cell can be a bacterial strain which endogenously expresses, or which is engineered to express, a 2,5-DKG reductase. As described in U.S. Pat. No. 5,032,514, 2,5-DKG reductases are found in genera including Brevibacterium, Arthrobacter, Micrococcus, Staphylococcus, Pseudomonas, Bacillus, Citrobacter and Corynebacterium. Therefore, a cell of the invention can be a bacterial cell of any of these genera, or a bacterial cell engineered to express a 2,5-DKG reductase of any of these genera.

A cell able to produce 2,5-DKG metabolites will preferably also be able to catalyze the extracellular production of 2,5-DKG from an inexpensive carbon source, such as glucose. An exemplary pathway from D-glucose to 2,5-DKG involves the enzymatic conversion of D-glucose to D-gluconic acid (catalyzed by D-glucose dehydrogenase), from D-gluconic acid to 2-Keto-D-gluconic acid (catalyzed by D-gluconate dehydrogenase), and from 2-Keto-D-gluconic acid to 2,5-DKG (catalyzed by 2-Keto-D-gluconic acid dehydrogenase), as is shown in FIG. 2. These steps can be carried out by organisms of several genera, including Gluconobacter, Acetobacter and Erwinia (also called Pantoea).

A bacterial cell useful for the production of 2-KLG from D-glucose is the Pantoea aggolmerans (also referred to as Erwinia herbicola or Acetomonas albosesamae) strain described in U.S. Pat. No. 5,032,514, designated ATCC 21998 ptrp 1-35 tkrAΔ3, or a derivative of this strain with improved properties. Contemplated improvements to this strain, which can be produced by genetic engineering, include deletion of enzymes that divert glucose to metabolites other than 2-KLG, such that yield of 2-KLG is increased. Other contemplated improvements to this strain include mutations that provide for improved recovery and purification of 2-KLG.

The Pantoea strain described in U.S. Pat. No. 5,032,514 recombinantly expresses a 2,5-DKG reductase from Corynebacterium (described in U.S. Pat. No. 4,757,012). The strain further contains a mutation that results in a non-functional tkrA gene and is thus deficient in 2-keto reductase activity. Mutation of the tkrA gene is advantageous in reducing metabolic diversion of 2-KLG to L-idonic acid, and metabolic diversion of 2,5-DKG to 5-keto-D-gluconate from 2-KLG.

Expression of one or more 2,5-DKG permeases of the invention in such cells significantly increases overall production of 2-KLG from D-glucose, which lowers the cost of commercial production of ascorbic acid.

The cells of the invention can contain one, two or more isolated nucleic acid molecules of the invention that encode polypeptides having 2,5-DKG permease activity. For example, the cell can contain an isolated nucleic acid molecule encoding at least one polypeptide having at least 80% identity to any of SEQ ID NOS:2, 4, 6, 8, 10 or 12, and optionally will contain two or more such nucleic acid molecules, in any combination. Preferably, at least one such encoded polypeptide selectively transports 2,5-DKG.

In a preferred embodiment, a bacterial cell of the invention suitable for bioproduction of 2-KLG contains an isolated nucleic acid molecule encoding a polypeptide having at least 95% identity to the 2,5-DKG selective permease designated SEQ ID NO:8 (prmA); and optionally further containing at least one isolated nucleic acid molecule encoding a polypeptide having at least 95% identity to a 2,5-DKG permease selected from the group consisting of SEQ ID NO:4 (PE6), SEQ ID NO:10 (prmB) and SEQ ID NO:6 (PK1).

The invention also provides a method of enhancing production of 2-KLG. The method consists of culturing a bacterial cell, wherein the cell contains an isolated nucleic acid molecule encoding a polypeptide which has 2,5-DKG permease activity, under conditions wherein the encoded 2,5-DKG permease is expressed and intracellular 2,5-DKG is converted to 2-KLG. Cells suitable for this purpose, such as the Pantoea strain described in U.S. Pat. No. 5,032,514, have been described above. optionally, the 2-KLG so produced can be chemically or enzymatically converted to a desired product such as ascorbic acid, following methods known in the art.

The invention further provides isolated oligonucleotide molecules that contain at least 17 contiguous nucleotides from any of the nucleotide sequences referenced as SEQ ID NOS:1, 3, 5, 7, 9 or 11. As used herein, the term “oligonucleotide” refers to a nucleic acid molecule that contains at least 17 contiguous nucleotides from the reference sequence and which may, but need not, encode a functional protein. Thus, an oligonucleotide of the invention can contain at least 18, 19, 20, 22 or 25 contiguous nucleotides, such as at least 30, 40, 50, 60, 70, 80, 90, 100, 125, 150, 175, 200, 250, 300, 400, 500, 750, 1000 or more contiguous nucleotides from the reference nucleotide sequence, up to the full length of the reference nucleotide sequence. The oligonucleotides of the invention are thus of sufficient length to be useful as sequencing primers, PCR primers, hybridization probes or antisense reagents, and can also encode polypeptides having 2,5-DKG permease activity, or immunogenic peptides therefrom. Those skilled in the art can determine the appropriate length and sequence of an oligonucleotide of the invention for a particular application.

For certain applications, such as for detecting 2,5-DKG expression in a cell or library, it will be desirable to use isolated oligonucleotide molecules of the invention that specifically hybridize to a nucleic acid molecule encoding a 2,5-DKG permease. The term “specifically hybridize” refers to the ability of a nucleic acid molecule to hybridize, under stringent hybridization conditions as described below, to a nucleic acid molecule that encodes a 2,5-DKG permease, without hybridizing to a substantial extent under the same conditions with nucleic acid molecules that do not encode 2,5-DKG permeases, such as unrelated molecules that fortuitously contain short regions of identity with a permease sequence. Thus, a nucleic acid molecule that “specifically hybridizes” is of a sufficient length and contains sufficient distinguishing sequence from a 2,5-DKG permease to be characteristic of the 2,5-DKG permease. Such a molecule will generally hybridize, under stringent conditions, as a single band on a Northern blot or Southern blot prepared from mRNA of a single species.

As used herein, the term “stringent conditions” refers to conditions equivalent to hybridization of a filter-bound nucleic acid molecule to a nucleic acid in a solution containing 50% formamide, 5X Denhart's solution, 5X SSPE, 0.2% SDS at 42° C., followed by washing the filter in 0.1×SSPE, and 0.1% SDS at 65° C. twice for 30 minutes. Equivalent conditions to the stringent conditions set forth above are well known in the art, and are described, for example in Sambrook et al., Molecular Cloning: A Laboratory Manual, Cold Spring Harbor Laboratory, New York (1992).

Nucleotide sequences that are characteristic of each of SEQ ID NOS:1, 3, 5, 7 or 9, or which are common to two, three or more of SEQ ID NOS:1, 3, 5, 7, 9 or 11 can readily be determined by aligning the sequences using a CLUSTAL V alignment program. Oligonucleotides containing regions which are common to two or more different 2,5-DKG permease nucleic acid molecules can advantageously be used as PCR primers or hybridization probes to isolate or detect nucleic acid molecules encoding 2,5-DKG permeases from other species.

The oligonucleotides of the invention can, but need not, encode polypeptides having 2,5-DKG activity. Thus, the invention oligonucleotides can contain sequences from the 5′ or 3′ untranslated region, or both, of the nucleotide sequences designated SEQ ID NOS:1, 3, 5, 7, 9 or 11, or contain coding sequences, or both. As described above with respect to the term “nucleic acid molecule,” the invention oligonucleotides can be derived from either the sense or antisense strand of the recited SEQ ID NO.

The oligonucleotides of the invention can also advantageously be used to direct the incorporation of amino acid additions, deletions or substitutions into a recombinant 2,5-DKG permease. In such applications, it will be understood that the invention oligonucleotides can contain nucleotide modifications with respect to SEQ ID NOS:1, 3, 5, 7, 9 or 11 such that the oligonucleotides encode the desired amino acid modifications to SEQ ID NOS:2, 4, 6, 8, 10 or 12, so long as they contain at least 17 contiguous residues from the reference sequence.

Exemplary oligonucleotides of the invention are oligonucleotides that contain a sequence selected from nucleotides 1-20, 1-100, 101-120, 101-200, 201-220, 201-300, 301-320, 301-400, 401-420, 401-500, 501-520, 501-600, 601-620, 601-700, 701-720, 701-800, 801-820, 801-900, 901-920, 901-1000, 1001-1020, 1001-1100, 1101-1120, 1100-1200, 1201-1220, 1201-1300, 1301-1320, 1301-1400, 1401-1420 or 1401-1500 of any of SEQ ID NOS:1, 3, 5, 7, 9 or 11.

The invention further provides a kit containing a pair of 2,5-DKG permease oligonucleotides packaged together, either in a single container or separate containers. The pair of oligonucleotides are preferably suitable for use in PCR applications for detecting or amplifying a nucleic acid molecule encoding a 2,5-DKG permease. The kit can further contain written instructions for use of the primer pair in PCR applications, or solutions and buffers suitable for such applications.

The invention further provides isolated oligonucleotides that contain a nucleotide sequence encoding a peptide having at least 10 contiguous amino acids of an amino acid selected from the group consisting of SEQ ID NOS:2, 4, 6, 8, 10 or 12. Such oligonucleotides can encode at least 10, 12, 15, 20, 25 or more contiguous amino acids of SEQ ID NOS:2, 4, 6, 8, 10 or 12, such as at least 30, 40, 50, 75, 100, 200, 300, 400 or more contiguous amino acids from the reference sequence. The encoded peptides can be expressed from such oligonucleotides, by routine methods, and used to produce, purify or characterize 2,5-DKG antibodies, as will be discussed further below. The peptides encoded by such oligonucleotides can, but need not, additionally have 2,5-DKG permease enzymatic activity.

In one embodiment, the isolated oligonucleotide encodes an amino acid sequence selected from amino acids 1-10, 1-50, 51-60, 51-100, 101-110, 101-150, 151-160, 151-200, 201-210, 201-250, 251-260, 251-300, 301-310, 301-350, 351-361, 351-400, 401-410, 401-439 of any of SEQ ID NOS:2, 4, 6, 8, 10 or 12.

Isolated nucleic acid molecules which encode polypeptides having 2,5-DKG permease activity, as well as the isolated oligonucleotides described above, will be subsequently referred as “2,5-DKG permease nucleic acid molecules.”

The isolated 2,5-DKG permease nucleic acid molecules of the invention can be prepared by methods known in the art. The method chosen will depend on factors such as the type and size of nucleic acid molecule one intends to isolate; whether or not it encodes a biologically active polypeptide (e.g. a polypeptide having permease activity or immunogenicity); and the source of the nucleic acid molecule. Those skilled in the art can isolate or prepare 2,5-DKG permease nucleic acid molecules as genomic DNA or desired fragments therefrom; as full-length cDNA or desired fragments therefrom; or as full-length mRNA or desired fragments therefrom, from any microorganism of interest.

An exemplary method of preparing a 2,5-DKG permease nucleic acid molecule is by isolating a recombinant construct which encodes and expresses a polypeptide having 2,5-DKG permease activity. As described in the Example, one useful method is to provide a metabolic selection system where bacterial cell growth is made dependent on expression of a 2,5-DKG permease, introducing expressible DNA, such as a cDNA or genomic library, into the assay cells, selecting surviving cells under the selective conditions, and isolating the introduced DNA. Alternatively, a screening method can be designed, such that a cell will exhibit a detectable signal only when expressing a functional 2,5-DKG permease. An exemplary detectable signal is intracellular incorporation of a detectable label present on 2,5-DKG. Additionaly screening and selection strategies suitable for identifying nucleic acid molecules encoding metabolic enzymes are described, for example, in PCT publication WO 00/22170 and U.S. Pat. Nos. 5,958,672 and 5,783,431.

A further method for producing an isolated 2,5-DKG permease nucleic acid molecule involves amplification of the nucleic acid molecule using 2,5-DKG permease-specific primers and the polymerase chain reaction (PCR). Using PCR, a 2,5-DKG permease nucleic acid molecule having any desired boundaries can be amplified exponentially starting from as little as a single gene or mRNA copy, from any cell having a 2,5-DKG permease gene.

Given the high degree of identity among the six disclosed 2,5-DKG permeases, those skilled in the art can design suitable primers for isolating additional 2,5-DKG permease nucleic acid molecules. Such primers are preferably degenerate oligonucleotides that encode, or are complementary to, short consensus amino acid sequences present in two or more of the 2,5-DKG permeases disclosed herein, such as oligonucleotides that encode 10 or more contiguous amino acids present in at least two of SEQ ID NOS:2, 6 and 10, or oligonucleotides that encode 10 or more contiguous amino acids present in at least two of SEQ ID NOS:4, 8 and 12. Such sequences can be determined from an alignment of amino acid sequences shown in FIG. 1. Exemplary amino acid sequences present in at least two of SEQ ID NOS:2, 6 and 10 are amino acids 19-31, 115-124, 146-156, and 339-348 of SEQ ID NO:2. Exemplary amino acid sequences present in at least two of SEQ ID NOS:4, 8 and 12 are amino acids 55-64, 60-69, 252-261, and 370-379 of SEQ ID NO:8.

Methods are well known in the art to determine or modify PCR reaction conditions when using degenerate primers to isolate a desired nucleic acid molecule. The amplified product can subsequently be sequenced, used as a hybridization probe, or used for 5′ or 3′ RACE to isolate flanking sequences, following procedures well known in the art and described, for example, in Ausubel et al., Current Protocols in Molecular Biology, John Wiley & Sons, New York (2000).

Given the high degree of sequence identity and structural relatedness among the six disclosed 2,5-DKG permeases, homologs from any other species can readily be identified by either hybridization or antibody screening. For example, an isolated 2,5-DKG permease nucleic acid molecule can be identified by screening a library, such as a genomic library, cDNA library or expression library, with a detectable nucleic acid molecule or antibody. Such libraries are commercially available from a variety of microorganisms, or can be produced from any available microorganism or environmental sample of interest using methods described, for example, in PCT publication WO 00/22170. The library clones identified as containing 2,5-DKG permease nucleic acid molecules can be isolated, subcloned and sequenced by routine methods.

Furthermore, 2,5-DKG permease nucleic acid molecules can be produced by direct synthetic methods. For example, a single stranded nucleic acid molecule can be chemically synthesized in one piece, or in several pieces, by automated synthesis methods known in the art. The complementary strand can likewise be synthesized in one or more pieces, and a double-stranded molecule made by annealing the complementary strands. Direct synthesis is particularly advantageous for producing relatively short molecules, such as oligonucleotide probes and primers, and also for producing nucleic acid molecules containing modified nucleotides or linkages.

The invention also provides an isolated polypeptide which has 2,5-DKG permease activity. Such isolated polypeptides, when expressed in their normal configuration at the cell membrane, are useful in applications in which enhanced uptake of 2,5-DKG is desirable, such as in bioproduction of 2-KLG. The isolated polypeptides of the invention can also be added to a culture medium, preferably in a membrane vesicle, to compete with membrane-bound permeases for 2,5-DKG, and thus to stop 2,5-DKG uptake. Thus, isolated polypeptides having 2,5-DKG permease activity can be used to regulate production of 2,5-DKG metabolites.

In one embodiment, an isolated polypeptide of the invention is not encoded by a nucleotide sequence completely contained within the nucleotide sequence designated SEQ ID NO:19 of WO 00/22170, which is the K. oxytoca via operon. In another embodiment, an isolated polypeptide of the invention is not completely contained within the amino acid sequence herein designated SEQ ID NO:12.

An “isolated” polypeptide of the invention is altered by the hand of man from how it is found in its natural environment. For example, an isolated 2,5-DKG permease can be a molecule that is recombinantly expressed, such that it is present at a higher level in its native host, or is present in a different host. Alternatively, an “isolated” 2,5-DKG permease of the invention can be a substantially purified molecule. Substantially purified 2,5-DKG permeases can be prepared by methods known in the art. Specifically with respect to a polypeptide encoding the yiaX2 polypeptide designated SEQ ID NO:12, the term “isolated” is intended to mean that polypeptide is not present in association with the polypeptides expressed by other genes in the K. oxytoca yia operon, such as the genes designated lyxK and orf1, described in WO 00/22170.

In one embodiment, an isolated polypeptide having 2,5-DKG permease activity contains an amino acid sequence having at least 40% identity to an amino acid sequence selected from the group consisting of SEQ ID NOS:2, 4, 6, 8, 10 or 12. Preferably, the encoded polypeptide will have at least 45% identity to any of the recited SEQ ID NOS, such as at least 50%, 60%, 70%, 80% identity, including at least 90%, 95%, 98%, 99% or greater identity.

In another embodiment, the isolated polypeptide having 2,5-DKG permease activity contains at least 10 contiguous amino acids of any of SEQ ID NOS:2, 4, 6, 8, 10 or 12. Exemplary invention polypeptides contain an amino acid sequence of amino acids 1-10, 1-50, 51-60, 51-100, 101-110, 101-150, 151-160, 151-200, 201-210, 201-250, 251-260, 251-300, 301-310, 301-350, 351-361, 351-400, 401-410, 401-439 of any of SEQ ID NOS:2, 4, 6, 8, 10 or 12.

Also provided is an isolated immunogenic peptide having an amino acid sequence derived from a 2,5-DKG permease. Such isolated immunogenic peptides are useful, for example, in preparing and purifying 2,5-DKG antibodies. The term “immunogenic,” as used herein, refers to a peptide that either is capable of inducing 2,5-DKG permease-specific antibodies, or capable of competing with 2,5-DKG permease-specific antibodies for binding to a 2,5-DKG permease. Peptides that are likely to be immunogenic can be predicted using methods and algorithms known in the art and described, for example, by Irnaten et al., Protein Eng. 11:949-955 (1998), and Savoie et al., Pac. Symp. Biocomput. 1999:182-189 (1999). The immunogenicity of the peptides of the invention can be confirmed by methods known in the art, such as by delayed-type hypersensitivity response assays in an animal sensitized to a 2,5-DKG permease, or by direct or competitive ELISA assays.

An isolated immunogenic peptide of the invention can contain at least 10 contiguous amino acids of a polypeptide selected from the group consisting of SEQ ID NOS:2, 4, 6, 8, 10 or 12, such as amino acids 1-10, 1-50, 51-60, 51-100, 101-110, 101-150, 151-160, 151-200, 201-210, 201-250, 251-260, 251-300, 301-310, 301-350, 351-361, 351-400, 401-410, 401-439 of any of SEQ ID NOS:2, 4, 6, 8, 10 or 12. Such a peptide can have at least 12, 15, 20, 25 or more contiguous amino acids of the reference sequence, including at least 30, 40, 50, 75, 100, 200, 300, 400 or more contiguous amino acids from the reference sequence, up to the full-length sequence.

For the production of antibodies that recognize 2,5-DKG permeases in their native configuration, such peptides will preferably contain at least part of an extracellular or intracellular domain from the permease. An extracellular or intracellular domain is generally characterized by containing at least one polar or positively or negatively charged residue, whereas a transmembrane domain is generally characterized as an uninterrupted stretch of about 20 contiguous hydrophobic residues. Commercially available computer topology programs can be used to determine whether a peptide is likely to correspond to an extracellular or intracellular domain or to a transmembrane region. Immunogenic peptides of the invention derived from a transmembrane region are useful to raise antibodies for use in applications such as immunoblotting, where the 2,5-DKG polypeptide need not be in its native configuration to be recognized.

The structural and functional characteristics and applications of 2,5-DKG permease polypeptides of the invention have been described above with respect to the encoding nucleic acid molecules, and are equally applicable in reference to the isolated polypeptides of the invention. Isolated polypeptides having 2,5-DKG permease activity, as well as the isolated immunogenic peptides of the invention, will subsequently be referred to as “2,5-DKG permeases.”

Methods for recombinantly producing 2,5-DKG permeases have been described above with respect to nucleic acid molecules, vectors and cells of the invention. 2,5-DKG permeases can alternatively be prepared by biochemical procedures, by isolating membranes from bacteria that naturally express, or recombinantly express, 2,5-DKG permeases. The membranes can be further fractionated by size or affinity chromatography, electrophoresis, or immunoaffinity procedures, to achieve the desired degree of purity. Purification can be monitored by a variety of procedures, such as by immunoreactivity with 2,5-DKG permease antibodies, or by a functional assay.

Immunogenic peptides can be produced from purified or partially purified 2,5-DKG permease polypeptides, for example, by enzymatic or chemical cleavage of the full-length polypeptide. Methods for enzymatic and chemical cleavage and for purification of the resultant peptide fragments are well known in the art (see, for example, Deutscher, Methods in Enzymology, Vol. 182, “Guide to Protein Purification,” San Diego: Academic Press, Inc. (1990)).

Alternatively, 2,5-DKG permeases can be produced by chemical synthesis. If desired, such as to optimize their functional activity, stability or bioavailability, such chemically synthesized molecules can include D-stereoisomers, non-naturally occurring amino acids, and amino acid analogs and mimetics. Sawyer, Peptide Based Drug Design, ACS, Washington (1995) and Gross and Meienhofer, The Peptides: Analysis, Synthesis, Biology, Academic Press, Inc., New York (1983). For certain applications, such as for detecting the polypeptide, it can also be useful to incorporate one or more detectably labeled amino acids into a chemically synthesized permease, such as radiolabeled or fluorescently labeled amino acids.

An isolated 2,5-DKG permease of the invention can further be conjugated to carrier molecules, such as keyhole lympet hemocyanin, which can enhance recognition by the immune system of the isolated 2,5-DKG permease for production of antibodies. For certain applications, such as to increase the stability or bioactivity of the molecule, or to facilitate its identification, the 2,5-DKG permease can be chemically or enzymatically derivatized, such as by acylation, phosphorylation or glycosylation.

The invention also provides an antibody specific for a polypeptide having 2,5-DKG permease activity, such as an antibody specific for a polypeptide having the amino acid sequence of any of SEQ ID NOS:2, 4, 6, 8, 10 or 12. Also provided is an antibody specific for an isolated peptide that contains at least 10 contiguous amino acids of any of SEQ ID NOS:2, 4, 6, 8, 10 or 12, wherein the peptide is immunogenic. The antibodies of the invention can be used, for example, to detect or isolate 2,5-DKG permeases from expression libraries or cells.

The term “antibody,” as used herein, is intended to include molecules having specific binding activity for a 2,5-DKG permease of at least about 1×10⁵ M⁻¹, preferably at least 1×10⁷ M⁻¹, more preferably at least 1×10⁹ M⁻¹. The term “antibody” includes both polyclonal and monoclonal antibodies, as well as antigen binding fragments of such antibodies (e.g. Fab, F(ab′)₂, Fd and Fv fragments and the like). In addition, the term “antibody” is intended to encompass non-naturally occurring antibodies, including, for example, single chain antibodies, chimeric antibodies, bifunctional antibodies, CDR-grafted antibodies and humanized antibodies, as well as antigen-binding fragments thereof.

Methods of preparing and isolating antibodies, including polyclonal and monoclonal antibodies, using peptide and polypeptide immunogens, are well known to those skilled in the art and are described, for example, in Harlow and Lane, Antibodies: A Laboratory Manual, Cold Spring Harbor Laboratory Press (1988). Non-naturally occurring antibodies can be constructed using solid phase peptide synthesis, can be produced recombinantly or can be obtained, for example, by screening combinatorial libraries consisting of variable heavy chains and variable light chains. Such methods are described, for example, in Huse et al. Science 246:1275-1281 (1989); Winter and Harris, Immunol. Today 14:243-246 (1993); Ward et al., Nature 341:544-546 (1989); Hilyard et al., Protein Engineering: A practical approach (IRL Press 1992); and Borrabeck, Antibody Engineering, 2d ed. (Oxford University Press 1995).

The following example is intended to illustrate but not limit the present invention.

EXAMPLE

This example shows the isolation and characterization of nucleic acid molecules encoding six novel polypeptides having 2,5-DKG permease activity.

Identification of yiaX2 as a 2,5-DKG Permease

WO 002170 describes the identification and sequencing of an operon from Klebsiella oxytoca, designated the yia operon, which contains eight putative open reading frames. Because disruption of this operon abolished the ability of K. oxytoca to utilize ascorbic acid as the sole carbon source, the yia operon was predicted to be involved in the catabolism of ascorbic acid. The functions of the polypeptides encoded by the individual open reading frames in the yia operon were not described in WO 002170.

It was determined that K. oxytoca was able to grow on 2,5-DKG as a sole carbon source and, therefore, it was concluded that K. oxytoca expressed a 2,5-DKG permease. It was predicted that such a permease would share structural properties with known bacterial transporter proteins, such as multiple transmembrane segments. One of the uncharacterized open reading frames in the yia operon, designated yiaX2, encoded a transmembrane polypeptide with about 33% identity to a known tartrate transporter, and was thus considered a candidate 2,5-DKG permease.

In order to determine whether yiaX2 encoded a 2,5-DKG permease, this gene was deleted from the chromosome of the K. oxytoca strain designated M5a1. M5a1 has also been described in the literature as K. pneumonia (see, for example, Streicher et al., Proc. Natl. Acad. Sci. 68:1174-1177 (1971)). The yiaX2 deletion mutant was constructed by joining sequences immediately upstream and downstream of the yiaX2 gene in a three-way ligation with the pMAK705 integration vector (described in Hamilton et al., J. Bacteriol. 171:4617-4622 (1989)). A fragment of about 1 kb in the orf1 gene was amplified using oligonucleotides 5′-ACCCAAGCTTCACCAAAAGAGTGAAGAGGAAG-3′ (SEQ ID NO:17) and 5′-CGTATCTAGAAAAATATTCTGGTGATGAAGGTGA-3 (SEQ ID NO:18), and digested with HindIII and XbaI. A fragment of a similar size in the lyxK gene was amplified with oligonucleotides 5′-AGACTCTAGATCCACATAAACGCACTGCGTAAAC-3′ (SEQ ID NO:19) and 5′-GAGGGGATCCTGGCTTCGTGAACGATATACTGG-3′ (SEQ ID NO:20), and digested with XbaI and BamHI. The two resulting fragments were ligated together between the HindIII and BamHI sites of the vector pMAK705. The resulting plasmid was transformed into K. oxytoca strain M5a1, and candidates in which the deletion construct had integrated by double crossover were obtained as described in Hamilton et al., supra (1989). The designation of the resulting K. oxytoca ΔyiaX2 strain is MGK002. The yiaX2-deficient phenotype was verified by by PCR analysis.

As described below, the K. oxytoca ΔyiaX2 [tkr idnO] strain was determined to grow very inefficiently on 2,5-DKG as the sole carbon source, and not to grow on 2-KLG. Confirmation that yiaX2 encoded a polypeptide having 2,5-DKG and 2-KLG permease activities was obtained by determining that adding back the gene restored the ability of the K. oxytoca ΔyiaX2 [tkr idnO] to grow well on either 2,5-DKG or 2-KLG (see below).

Construction of K. oxytoca ΔyiaX2 [tkr idnO]

In order to identify additional 2,5-DKG permeases, and preferably permeases selective for 2,5-DKG, a metabolic selection strategy was utilized. As described in WO 00/22170, metabolic selection is advantageous in allowing rapid identification of functional genes from uncharacterized and even unculturable microorganisms, without any prior sequence information.

A tester strain for the metabolic selection of nucleic acid molecules encoding 2,5-DKG permeases was prepared by engineering K. oxytoca ΔyiaX2 to express enzymes involved in the catabolism of 2,5-DKG to gluconic acid, which can be converted to carbon and energy. Enzymes capable of catabolizing 2,5-DKG to gluconic acid are encoded by the tkr and idnO genes of the tkr idnD idnO operon designated SEQ ID NO:13.

The tkr idnD idnO operon (SEQ ID NO:13) was subcloned into the high copy number vector pUC19 and the resulting clone, designated pDF33, was transformed into K. oxytoca ΔyiaX2. The resultingtester strain (designated MGK002 [pDF33] or K. oxytoca ΔyiaX2 [tkr idnO]) thus expresses all polypeptides required for the utilization of 2,5-DKG as a sole carbon source, but is deficient in 2,5-DKG permease activity to transport extracellular 2,5-DKG into the cell. Therefore, a nucleic acid molecule that encodes a 2,5-DKG permease, upon expression in the tester strain, should confer the ability of the tester strain to grow on 2,5-DKG. The metabolic selection strategy is shown schematically in FIG. 3.

To validate the proposed metabolic selection strategy, as a positive control the yiaX2 gene was reintroduced into the tester strain to confirm that it conferred the ability to grow on 2,5-DKG and 2-KLG. The yiaX2 open reading frame (nucleotides 3777 to 5278 of SEQ ID NO:19 of WO 00/22170) was PCR-amplified using olignucleotides 5′-AATAGGATCCTTCATCACCAGAATATTTTTA-3′ (SEQ ID NO:21) and 5′-CATAGGTACCGGCTTTCAGATAGGTGCC-3′ (SEQ ID NO:22) digested with BamH1 and Kpn1 and ligated into pCL1920 (Lerner et al., Nucl. Acids. Res. 18:4631 (1990); and see description below) previously digested with the same restriction enzymes. K. oxytoca ΔyiaX2 [tkr idnO], transformed with the resulting construct, was able to grow overnight at 30° C. on M9 minimal agar medium supplemented with either 2-KLG or 2,5-DKG (0.25%) and 0.1 mM IPTG. Therefore, K. oxytoca ΔyiaX2 [tkr idnO] was confirmed to be an appropriate tester strain to identify additional novel 2,5-DKG permeases, and to determine their selectivity.

Construction of Bacterial Genomic Libraries

The cloning vector used for constructing the above positive control and for preparing bacterial genomic libraries is plasmid pCL1920 (Lerner et al., supra, 1990), a low-copy number expression vector which carries a spectinomycin/streptomycin resistance determinant. Expression is driven by the lacPO promoter/operator region which is repressed by the lacI^(q) gene product when provided by the host, and induced in the presence of 0.01 to 1 mM IPTG.

Genomic DNA from the following species and isolates was prepared according to the method outlined below: Pantoea citrea (ATCC 39140), Klebsiella oxytoca MGK002 (ΔyiaX2), Pseudomonas aeruginosa, and a mixture of 25 environmental isolates, obtained from 18 different soil and water samples, and able to grow on 2,5-DKG as the sole carbon source. Klebsiella oxytoca MGK002 (ΔyiaX2) was among the bacteria chosen because there was a slight amount of background growth observable in the tester strain on 2,5-DKG as the sole carbon source, and some 2,5-DKG permease activity in an uptake assay. However, the tester strain did not grow on 2-KLG, and exhibited no detectable 2-KLG uptake, suggesting the presence of a second 2,5-DKG permease with selectivity for 2,5-DKG in K. oxytoca.

Five milliliters of an overnight culture in LB (30° C.) were centrifuged for 5 min at 6,000 rpm. Pellets were washed with 1.5 ml Tris 10 mM, EDTA 1 mM pH 8.0 (TE), centrifuged again and resuspended in 0.4 ml TE. Lysozyme (5 mg/ml) and RNase (100 pg/ml) were added and cells were incubated for 10 min at 37° C. Sodium dodecylsulfate (SDS) was added to a final concentration of 1% and the tubes were gently shaken until lysis was complete. One hundred microliters of a 5N NaCl0₄ stock solution were added to the lysate. The mixture was extracted once with one volume of phenol:chloroform (1:1) and once with one volume of chloroform. Chromosomal DNA was precipitated by adding 2 ml of cold (−20° C.) ethanol and gently coiling the precipitate around a curved Pasteur pipette. DNA was dried for 30 min at room temperature and resuspended in 50 to 100 μl of Tris 10 mM, EDTA 1 mM, NaCl 50 mM pH 8.0 to obtain a DNA concentration of 0.5 to 1 μg/μl. Genomic DNA preparations from each environmental isolate were mixed in equal ratios to prepare a single mixed library.

For each preparation, an aliquot of 10-15 μl of genomic DNA was subjected to Sau3A controlled digestion in order to obtain fragments ranging between 3 to 20 kb in size. Half that amount was ligated with the low-copy number expression vector pCL1920, which had previously been digested with BamHI and dephosphorylated. The resulting genomic libraries were transformed into E.coli DH10B electrocompetent cells (GIBCO-BRL) and briefly amplified overnight at 30° C. on LB-agar supplemented with 100 μg/ml spectinomycin. For each library, 30,000 to 120,000 clones were plated out and plasmid DNA was bulk-extracted using standard procedures. Insert size was randomly checked and the amplified libraries were stored in the form of plasmid DNA at −20° C. for further use in the tester strain.

Selection, Identification and Sequencing of Permease Genes

An aliquot of each genomic library was introduced by electroporation into the K. oxytoca ΔyiaX2 [tkr idnO] (MGK002 [pDF33]) strain. The amount of DNA used in the transformation was adjusted in order to plate out 5×10⁵ to 1×10⁶ clones per library on the selective medium. Each selection round was plated on LB-agar containing 100 μg/ml spectinomycin, then replica-plated onto M9-agar plates containing 2.5% 2,5-DKG and 0.1 mM IPTG and adjusted to pH 4.5. The clones that grew on 2,5-DKG were transferred into K. oxytoca ΔyiaX2 (MGK002) devoid of plasmid pDF33, to verify that the tkr idnD0 pathway was indeed required for growth of those clones on 2,5-DKG. A brief genetic characterization was performed to eliminate identical clones. Following preliminary 2,5-DKG/2-KLG uptake assays, 5 clones were retained for further analysis: 2 originated from the Pantoea citrea library, 1 from K. oxytoca and 2 from the mixed environmental library.

In all cases, DNA sequencing of the vector inserts revealed the presence of a nucleotide sequence (SEQ ID NOS:1, 3, 5, 7 and 9) encoding a polypeptide (SEQ ID NOS:2, 4, 6, 8 and 10) displaying homology with published transporters and with yiaX2 (SEQ ID NO:11, and its encoded polypeptide SEQ ID NO:12). Also present on these inserts were other orfs, and in most cases an endogenous promoter.

The insert containing both of the prmA and prmB orfs (SEQ ID NOS:7 and 9) was about 9 kb, and also contained an orf homologous to bacterial idnO, two orfs encoding transcriptional repressors, an orf of unknown function, and 3 orfs encoding homologs of E. coli polypeptides involved in nitrate utilization.

The insert containing the PE1 orf (SEQ ID NO:1) was about 3 kb, and also contained a putative dehydro-deoxygluconokinase gene closely related to the B. subtilis kdgK gene and a homolog of the E. coli ydcG gene.

The insert containing the PE6 orf (SEQ ID NO:3) was about 6.7 kb. The genomic environment of PE6 appeared similar to the yia operon of E. coli and K. oxytoca, as SEQ ID NO:4 was preceded by a yiaL homolog and a yiaK homolog was also present on the insert.

The insert containing the PK1 orf (SEQ ID NO:5) was about 5.5 kb. In contrast to the other inserts, this insert did not appear to contain an endogenous promoter, indicating that the PK1 orf was apparently transcribed from the vector's promoter. The PK1 orf was directly followed by a tkr homolog.

Nucleic acid molecules encoding each 2,5-DKG permease were reintroduced into K. oxytoca ΔyiaX2 [tkr idnO] and the resulting strains assayed for growth on 2,5-DKG and 2-KLG, and also assayed for uptake of radiolabeled 2,5-DKG and 2-KLG.

The uptake assays were performed by mixing radioactive 2-KLG or 2,5-DKG with IPTG-induced cells, removing aliquots at regular intervals, and measuring both the decrease in radioactivity in the supernatant and the appearance of radioactivity in the cells over time. The results of the growth assays and 2,5-DKG uptake assay are shown in Table 1, below.

TABLE 1 Recombinantly 2, 5-DKG expressed Cell Growth Cell Growth Uptake 2, 5 DKG Permease on 2, 5-DKG on 2-KLG (g/l/h) YiaX2 + ++ 3.7 PE1 ++ ++ 4.2 PE6 ++ ++ 5.0 prmA ++ ++ 5.5 prmB +/− ND 0.9 prmA and prmB ++ ND 9.9 PK1 ++ − 4.2 Control bkgd − 1.0 (K. oxytoca ΔyiaX2/ tkr/idn0)

Nucleic acid molecules encoding the different permeases were also subcloned into a variety of vectors, including the high copy number vector pSE380 (which contains a tac promoter), the medium copy number vector pACYC184 (which is promoterless), or the low copy number vector pCL1920, and introduced into a Pantoea strain suitable for bioproduction of 2-KLG from glucose (see U.S. Pat. No. 5,032,514). The resulting strains were assessed under biofermentation conditions to determine which combinations of nucleic acid molecules, promoters and vectors are optimal for enhancing 2-KLG production.

All journal article, reference and patent citations provided above, in parentheses or otherwise, whether previously stated or not, are incorporated herein by reference in their entirety.

Although the invention has been described with reference to the examples provided above, it should be understood that various modifications can be made without departing from the spirit of the invention.

                   #             SEQUENCE LISTING <160> NUMBER OF SEQ ID NOS: 22 <210> SEQ ID NO 1 <211> LENGTH: 1500 <212> TYPE: DNA <213> ORGANISM: Unknown <220> FEATURE: <223> OTHER INFORMATION: environmental source <221> NAME/KEY: CDS <222> LOCATION: (94)...(1374) <400> SEQUENCE: 1 ggcgaatagc ccggccggcg tcataataac ggccttctct gtaccctaca ta #cggcggcg     60 gcgtcatgaa cctcaacttt agtaggcaag cct atg aac agc tc #t acc aat gca     114                    #                   # Met Asn Ser Ser Thr Asn Ala                    #                   #  1               5 acg aaa cgc tgg tgg tac atc atg cct atc gt #g ttt atc acg tat agc      162 Thr Lys Arg Trp Trp Tyr Ile Met Pro Ile Va #l Phe Ile Thr Tyr Ser          10          #         15          #         20 ctg gcg tat ctc gac cgc gca aac ttc agc tt #t gct tcg gca gcg ggc      210 Leu Ala Tyr Leu Asp Arg Ala Asn Phe Ser Ph #e Ala Ser Ala Ala Gly      25              #     30              #     35 att acg gaa gat tta ggc att acc aaa ggc at #c tcg tcg ctt ctt ggc      258 Ile Thr Glu Asp Leu Gly Ile Thr Lys Gly Il #e Ser Ser Leu Leu Gly  40                  # 45                  # 50                  # 55 gca ctt ttc ttc ctc ggc tat ttc ttc ttc ca #g atc ccg ggg gcg att      306 Ala Leu Phe Phe Leu Gly Tyr Phe Phe Phe Gl #n Ile Pro Gly Ala Ile                  60  #                 65  #                 70 tac gcg gaa cgc cgt agc gta cgg aag ctg at #t ttc atc tgt ctg atc      354 Tyr Ala Glu Arg Arg Ser Val Arg Lys Leu Il #e Phe Ile Cys Leu Ile              75      #             80      #             85 ctg tgg ggc gcc tgc gcc tcg ctt gac cgg ga #t ggt gca caa tat tcc      402 Leu Trp Gly Ala Cys Ala Ser Leu Asp Arg As #p Gly Ala Gln Tyr Ser          90          #         95          #        100 agc gct ggc tgg cga tcc gtt tta ttc tcg gc #t gtc gtg gaa gcg gcg      450 Ser Ala Gly Trp Arg Ser Val Leu Phe Ser Al #a Val Val Glu Ala Ala     105               #   110               #   115 gtc atg ccg gcg atg ctg att tac atc agt aa #c tgg ttt acc aaa tca      498 Val Met Pro Ala Met Leu Ile Tyr Ile Ser As #n Trp Phe Thr Lys Ser 120                 1 #25                 1 #30                 1 #35 gaa cgt tca cgc gcc aac acc ttc tta atc ct #c ggc aac ccg gtc acg      546 Glu Arg Ser Arg Ala Asn Thr Phe Leu Ile Le #u Gly Asn Pro Val Thr                 140   #               145   #               150 gta ctg tgg atg tcg gtg gtc tcc ggc tac ct #g att cag tcc ttc ggc      594 Val Leu Trp Met Ser Val Val Ser Gly Tyr Le #u Ile Gln Ser Phe Gly             155       #           160       #           165 tgg cgt gaa atg ttt att att gaa ggc gtt cc #g gcc gtc ctc tgg gcc      642 Trp Arg Glu Met Phe Ile Ile Glu Gly Val Pr #o Ala Val Leu Trp Ala         170           #       175           #       180 ttc tgc tgg tgg gtg ctg gtc aaa gtt aaa cc #g tcg cag gtg aac tgg      690 Phe Cys Trp Trp Val Leu Val Lys Val Lys Pr #o Ser Gln Val Asn Trp     185               #   190               #   195 ttg tcg gaa aac gag aaa gcc gcg ctg cag gc #g cag ctg gag agc gag      738 Leu Ser Glu Asn Glu Lys Ala Ala Leu Gln Al #a Gln Leu Glu Ser Glu 200                 2 #05                 2 #10                 2 #15 cag cag ggt att aaa gcc gtg cgt aac tac gg #c gaa gcc ttc cgc tca      786 Gln Gln Gly Ile Lys Ala Val Arg Asn Tyr Gl #y Glu Ala Phe Arg Ser                 220   #               225   #               230 cgc aac gtc att cta ctg tgc atg cag tat tt #t gcc tgg agt atc ggc      834 Arg Asn Val Ile Leu Leu Cys Met Gln Tyr Ph #e Ala Trp Ser Ile Gly             235       #           240       #           245 gtg tac ggt ttt gtg ctg tgg ttg ccg tca at #t att cgc agc ggc ggc      882 Val Tyr Gly Phe Val Leu Trp Leu Pro Ser Il #e Ile Arg Ser Gly Gly         250           #       255           #       260 gtc aat atg ggg atg gtg gaa gtc ggc tgg ct #c tct tcg gtg cct tat      930 Val Asn Met Gly Met Val Glu Val Gly Trp Le #u Ser Ser Val Pro Tyr     265               #   270               #   275 ctg gcc gcg act att gcg atg atc gtc gtc tc #c tgg gct tcc gat aaa      978 Leu Ala Ala Thr Ile Ala Met Ile Val Val Se #r Trp Ala Ser Asp Lys 280                 2 #85                 2 #90                 2 #95 atg cag aac cgt aaa ctg ttc gtc tgg ccg ct #g ctg ctg att ggc gga     1026 Met Gln Asn Arg Lys Leu Phe Val Trp Pro Le #u Leu Leu Ile Gly Gly                 300   #               305   #               310 ctg gct ttt att ggc tca tgg gcc gtc ggc gc #t aac cat ttc tgg gcc     1074 Leu Ala Phe Ile Gly Ser Trp Ala Val Gly Al #a Asn His Phe Trp Ala             315       #           320       #           325 tct tat acc ctg ctg gtg att gcc aat gcg gc #a atg tac gcc cct tac     1122 Ser Tyr Thr Leu Leu Val Ile Ala Asn Ala Al #a Met Tyr Ala Pro Tyr         330           #       335           #       340 ggt ccg ttt ttc gcc atc att ccg gaa atg ct #g ccg cgt aac gtc gcc     1170 Gly Pro Phe Phe Ala Ile Ile Pro Glu Met Le #u Pro Arg Asn Val Ala     345               #   350               #   355 ggt ggc gca atg gcg ctc atc aac agc atg gg #g gcc tta ggt tca ttc     1218 Gly Gly Ala Met Ala Leu Ile Asn Ser Met Gl #y Ala Leu Gly Ser Phe 360                 3 #65                 3 #70                 3 #75 ttt ggt tcg tgg ttc gtg ggc tac ctg aac gg #c acc acc ggc agt cca     1266 Phe Gly Ser Trp Phe Val Gly Tyr Leu Asn Gl #y Thr Thr Gly Ser Pro                 380   #               385   #               390 tca gcc tca tac att ttc atg gga gtg gcg ct #t ttc gcc tcg gta tgg     1314 Ser Ala Ser Tyr Ile Phe Met Gly Val Ala Le #u Phe Ala Ser Val Trp             395       #           400       #           405 ctt act tta att gtt aag cct gct aac aat ca #a aag ctc ccc atc ggc     1362 Leu Thr Leu Ile Val Lys Pro Ala Asn Asn Gl #n Lys Leu Pro Ile Gly         410           #       415           #       420 gct cgt cac gcc tgacctttac tacttacgga gatcacgcct tg #ggtacgtt         1414 Ala Arg His Ala     425 gcaggacaaa ccgataggca ccgcaaaggc tggggccatc gagcagcgcg ta #aacagtca   1474 gctggttgct gtcgctgtgc ggcgtc           #                   #            1500 <210> SEQ ID NO 2 <211> LENGTH: 427 <212> TYPE: PRT <213> ORGANISM: Unknown <220> FEATURE: <223> OTHER INFORMATION: environmental source <400> SEQUENCE: 2 Met Asn Ser Ser Thr Asn Ala Thr Lys Arg Tr #p Trp Tyr Ile Met Pro  1               5   #                10   #                15 Ile Val Phe Ile Thr Tyr Ser Leu Ala Tyr Le #u Asp Arg Ala Asn Phe             20       #            25       #            30 Ser Phe Ala Ser Ala Ala Gly Ile Thr Glu As #p Leu Gly Ile Thr Lys         35           #        40           #        45 Gly Ile Ser Ser Leu Leu Gly Ala Leu Phe Ph #e Leu Gly Tyr Phe Phe     50               #    55               #    60 Phe Gln Ile Pro Gly Ala Ile Tyr Ala Glu Ar #g Arg Ser Val Arg Lys 65                   #70                   #75                   #80 Leu Ile Phe Ile Cys Leu Ile Leu Trp Gly Al #a Cys Ala Ser Leu Asp                 85   #                90   #                95 Arg Asp Gly Ala Gln Tyr Ser Ser Ala Gly Tr #p Arg Ser Val Leu Phe             100       #           105       #           110 Ser Ala Val Val Glu Ala Ala Val Met Pro Al #a Met Leu Ile Tyr Ile         115           #       120           #       125 Ser Asn Trp Phe Thr Lys Ser Glu Arg Ser Ar #g Ala Asn Thr Phe Leu     130               #   135               #   140 Ile Leu Gly Asn Pro Val Thr Val Leu Trp Me #t Ser Val Val Ser Gly 145                 1 #50                 1 #55                 1 #60 Tyr Leu Ile Gln Ser Phe Gly Trp Arg Glu Me #t Phe Ile Ile Glu Gly                 165   #               170   #               175 Val Pro Ala Val Leu Trp Ala Phe Cys Trp Tr #p Val Leu Val Lys Val             180       #           185       #           190 Lys Pro Ser Gln Val Asn Trp Leu Ser Glu As #n Glu Lys Ala Ala Leu         195           #       200           #       205 Gln Ala Gln Leu Glu Ser Glu Gln Gln Gly Il #e Lys Ala Val Arg Asn     210               #   215               #   220 Tyr Gly Glu Ala Phe Arg Ser Arg Asn Val Il #e Leu Leu Cys Met Gln 225                 2 #30                 2 #35                 2 #40 Tyr Phe Ala Trp Ser Ile Gly Val Tyr Gly Ph #e Val Leu Trp Leu Pro                 245   #               250   #               255 Ser Ile Ile Arg Ser Gly Gly Val Asn Met Gl #y Met Val Glu Val Gly             260       #           265       #           270 Trp Leu Ser Ser Val Pro Tyr Leu Ala Ala Th #r Ile Ala Met Ile Val         275           #       280           #       285 Val Ser Trp Ala Ser Asp Lys Met Gln Asn Ar #g Lys Leu Phe Val Trp     290               #   295               #   300 Pro Leu Leu Leu Ile Gly Gly Leu Ala Phe Il #e Gly Ser Trp Ala Val 305                 3 #10                 3 #15                 3 #20 Gly Ala Asn His Phe Trp Ala Ser Tyr Thr Le #u Leu Val Ile Ala Asn                 325   #               330   #               335 Ala Ala Met Tyr Ala Pro Tyr Gly Pro Phe Ph #e Ala Ile Ile Pro Glu             340       #           345       #           350 Met Leu Pro Arg Asn Val Ala Gly Gly Ala Me #t Ala Leu Ile Asn Ser         355           #       360           #       365 Met Gly Ala Leu Gly Ser Phe Phe Gly Ser Tr #p Phe Val Gly Tyr Leu     370               #   375               #   380 Asn Gly Thr Thr Gly Ser Pro Ser Ala Ser Ty #r Ile Phe Met Gly Val 385                 3 #90                 3 #95                 4 #00 Ala Leu Phe Ala Ser Val Trp Leu Thr Leu Il #e Val Lys Pro Ala Asn                 405   #               410   #               415 Asn Gln Lys Leu Pro Ile Gly Ala Arg His Al #a             420       #           425 <210> SEQ ID NO 3 <211> LENGTH: 1775 <212> TYPE: DNA <213> ORGANISM: Unknown <220> FEATURE: <223> OTHER INFORMATION: environmental source <221> NAME/KEY: CDS <222> LOCATION: (214)...(1491) <400> SEQUENCE: 3 ggcaatttgc ggtgtttttt ccgcaggacg ttcatcgtcc ggcctgtatt ca #tcaacggc     60 cctgcgctat tcgcaaagtg gtggtgaaaa taccgctgcg ttatttaacg cc #caataagc    120 aacaccgagt ttataaccct gaacgacacg gctgcgggcc tgtgtagacg cc #cctacgcc    180 ttaacaccac taaatgactc tacaggtgta tat atg aat aca gc #c tct gtt tct     234                    #                   # Met Asn Thr Ala Ser Val Ser                    #                   #  1               5 gtc acc caa agc cag gcg atc ccc aaa tta cg #c tgg ttg aga ata gtg      282 Val Thr Gln Ser Gln Ala Ile Pro Lys Leu Ar #g Trp Leu Arg Ile Val          10          #         15          #         20 ccg cct att ctt att acc tgc att att tcc ta #t atg gac cgg gtg aac      330 Pro Pro Ile Leu Ile Thr Cys Ile Ile Ser Ty #r Met Asp Arg Val Asn      25              #     30              #     35 atc gcc ttc gcc atg ccc ggc ggc atg gac ga #t gaa ctg ggc atc acc      378 Ile Ala Phe Ala Met Pro Gly Gly Met Asp As #p Glu Leu Gly Ile Thr  40                  # 45                  # 50                  # 55 gcc tcg atg gcc ggg ttg gcc ggc ggt att tt #c ttt atc ggt tat ctg      426 Ala Ser Met Ala Gly Leu Ala Gly Gly Ile Ph #e Phe Ile Gly Tyr Leu                  60  #                 65  #                 70 ttc ttg cag gta ccc ggc ggc aag ctg gcg gt #g tac ggc aac ggc aag      474 Phe Leu Gln Val Pro Gly Gly Lys Leu Ala Va #l Tyr Gly Asn Gly Lys              75      #             80      #             85 aaa ttc atc ggt tgg tcg ttg ttg gcc tgg gc #g gtg att tcc gtg ctg      522 Lys Phe Ile Gly Trp Ser Leu Leu Ala Trp Al #a Val Ile Ser Val Leu          90          #         95          #        100 acc ggg ctg gtc acg aat cag tat caa ttg ct #g ttc ctg cgc ttc gcc      570 Thr Gly Leu Val Thr Asn Gln Tyr Gln Leu Le #u Phe Leu Arg Phe Ala     105               #   110               #   115 ctc ggc cgt ttc cga agc ggc atg ctg cgg tg #g gtg ctg acc atg atc      618 Leu Gly Arg Phe Arg Ser Gly Met Leu Arg Tr #p Val Leu Thr Met Ile 120                 1 #25                 1 #30                 1 #35 agc aac tgg ttc ccg gac aag gaa cgc ggg cg #c gcc aac gcc atc gtc      666 Ser Asn Trp Phe Pro Asp Lys Glu Arg Gly Ar #g Ala Asn Ala Ile Val                 140   #               145   #               150 atc atg ttc gtg ccg atc gcc ggc atc ctt ac #c gca ccg ctg tcc ggc      714 Ile Met Phe Val Pro Ile Ala Gly Ile Leu Th #r Ala Pro Leu Ser Gly             155       #           160       #           165 tgg atc atc acc gcc tgg gac tgg cgc atg ct #g ttc ctg gtc gag ggc      762 Trp Ile Ile Thr Ala Trp Asp Trp Arg Met Le #u Phe Leu Val Glu Gly         170           #       175           #       180 gcg ctg tcg ctg gtc gtg atg gtg ctg tgg ta #t ttc acc atc agc aac      810 Ala Leu Ser Leu Val Val Met Val Leu Trp Ty #r Phe Thr Ile Ser Asn     185               #   190               #   195 cgt cca caa gag gcc aaa agg att tcg cag gc #g gaa aaa gat tat ctg      858 Arg Pro Gln Glu Ala Lys Arg Ile Ser Gln Al #a Glu Lys Asp Tyr Leu 200                 2 #05                 2 #10                 2 #15 atc aaa acg ctg cac gac gaa cag ttg ctg at #c aaa ggc aaa acg gtg      906 Ile Lys Thr Leu His Asp Glu Gln Leu Leu Il #e Lys Gly Lys Thr Val                 220   #               225   #               230 cgc aac gcc tcg ctg cgt cgg gtg ctg ggc ga #c aaa atc atg tgg aag      954 Arg Asn Ala Ser Leu Arg Arg Val Leu Gly As #p Lys Ile Met Trp Lys             235       #           240       #           245 ttc ttc tac cag acc ggg ata tac ggc tac ac #c ctg tgg ctg ccg acc     1002 Phe Phe Tyr Gln Thr Gly Ile Tyr Gly Tyr Th #r Leu Trp Leu Pro Thr         250           #       255           #       260 att ctc aag ggg ctc acc aac ggc aat atg ga #g cag gtc ggg atg ctg     1050 Ile Leu Lys Gly Leu Thr Asn Gly Asn Met Gl #u Gln Val Gly Met Leu     265               #   270               #   275 gct atc ctg ccc tat atc ggc gcc atc ttc gg #c atg ctg atc att tcc     1098 Ala Ile Leu Pro Tyr Ile Gly Ala Ile Phe Gl #y Met Leu Ile Ile Ser 280                 2 #85                 2 #90                 2 #95 acc ctc tcc gat cgc acc ggc aag cgc aaa gt #g ttc gtc gca ctg ccg     1146 Thr Leu Ser Asp Arg Thr Gly Lys Arg Lys Va #l Phe Val Ala Leu Pro                 300   #               305   #               310 ctg gcc tgc ttt gcc atc tgc atg gcg ctg tc #g gtg ctg ctg aag gat     1194 Leu Ala Cys Phe Ala Ile Cys Met Ala Leu Se #r Val Leu Leu Lys Asp             315       #           320       #           325 cac atc tgg tgg tcg tac gcg gcg ctg gtg gg #c tgt ggc gtc ttt acc     1242 His Ile Trp Trp Ser Tyr Ala Ala Leu Val Gl #y Cys Gly Val Phe Thr         330           #       335           #       340 cag gcc gcc gcc ggg gtg ttc tgg acc att cc #g ccc aag ctg ttt aac     1290 Gln Ala Ala Ala Gly Val Phe Trp Thr Ile Pr #o Pro Lys Leu Phe Asn     345               #   350               #   355 gcc gaa atg gcc ggc ggc gcg cgc ggc gtg at #c aat gca ctg ggc aac     1338 Ala Glu Met Ala Gly Gly Ala Arg Gly Val Il #e Asn Ala Leu Gly Asn 360                 3 #65                 3 #70                 3 #75 ctc ggc ggt ttc tgc ggc ccc tat atg gtc gg #c gtg ttg atc acc ttg     1386 Leu Gly Gly Phe Cys Gly Pro Tyr Met Val Gl #y Val Leu Ile Thr Leu                 380   #               385   #               390 ttc agc aaa gac gtc ggc gtt tac agc ctc gc #g gtg tcg ctg gcc tcc     1434 Phe Ser Lys Asp Val Gly Val Tyr Ser Leu Al #a Val Ser Leu Ala Ser             395       #           400       #           405 gcc tcg gtg ctg gcg ttg atg ctg ccg aac ag #a tgc gac caa aaa gcg     1482 Ala Ser Val Leu Ala Leu Met Leu Pro Asn Ar #g Cys Asp Gln Lys Ala         410           #       415           #       420 ggg gcc gaa taatggacta ttggctgggg ctggactgcg gcggcacct #t             1531 Gly Ala Glu     425 tatcaaagcc ggcctgtatg accggaatgg cgcagaactg ggcatagccc gc #cgtacgct   1591 ggacattgtc gcgccgcaac ccggctgggc ggaacgtgac atgcccgcgc tg #tggcagac   1651 cgccgccgag gtgatccgcg aattgctggc ccgcaacgac attgccgacg ct #gatattca   1711 ggccatcggc atctcggcgc agggtaaagg cgcgtttttg ttagacgagc aa #ggccaacc   1771 gttg                  #                   #                   #           1775 <210> SEQ ID NO 4 <211> LENGTH: 426 <212> TYPE: PRT <213> ORGANISM: Unknown <220> FEATURE: <223> OTHER INFORMATION: environmental source <400> SEQUENCE: 4 Met Asn Thr Ala Ser Val Ser Val Thr Gln Se #r Gln Ala Ile Pro Lys  1               5   #                10   #                15 Leu Arg Trp Leu Arg Ile Val Pro Pro Ile Le #u Ile Thr Cys Ile Ile             20       #            25       #            30 Ser Tyr Met Asp Arg Val Asn Ile Ala Phe Al #a Met Pro Gly Gly Met         35           #        40           #        45 Asp Asp Glu Leu Gly Ile Thr Ala Ser Met Al #a Gly Leu Ala Gly Gly     50               #    55               #    60 Ile Phe Phe Ile Gly Tyr Leu Phe Leu Gln Va #l Pro Gly Gly Lys Leu 65                   #70                   #75                   #80 Ala Val Tyr Gly Asn Gly Lys Lys Phe Ile Gl #y Trp Ser Leu Leu Ala                 85   #                90   #                95 Trp Ala Val Ile Ser Val Leu Thr Gly Leu Va #l Thr Asn Gln Tyr Gln             100       #           105       #           110 Leu Leu Phe Leu Arg Phe Ala Leu Gly Arg Ph #e Arg Ser Gly Met Leu         115           #       120           #       125 Arg Trp Val Leu Thr Met Ile Ser Asn Trp Ph #e Pro Asp Lys Glu Arg     130               #   135               #   140 Gly Arg Ala Asn Ala Ile Val Ile Met Phe Va #l Pro Ile Ala Gly Ile 145                 1 #50                 1 #55                 1 #60 Leu Thr Ala Pro Leu Ser Gly Trp Ile Ile Th #r Ala Trp Asp Trp Arg                 165   #               170   #               175 Met Leu Phe Leu Val Glu Gly Ala Leu Ser Le #u Val Val Met Val Leu             180       #           185       #           190 Trp Tyr Phe Thr Ile Ser Asn Arg Pro Gln Gl #u Ala Lys Arg Ile Ser         195           #       200           #       205 Gln Ala Glu Lys Asp Tyr Leu Ile Lys Thr Le #u His Asp Glu Gln Leu     210               #   215               #   220 Leu Ile Lys Gly Lys Thr Val Arg Asn Ala Se #r Leu Arg Arg Val Leu 225                 2 #30                 2 #35                 2 #40 Gly Asp Lys Ile Met Trp Lys Phe Phe Tyr Gl #n Thr Gly Ile Tyr Gly                 245   #               250   #               255 Tyr Thr Leu Trp Leu Pro Thr Ile Leu Lys Gl #y Leu Thr Asn Gly Asn             260       #           265       #           270 Met Glu Gln Val Gly Met Leu Ala Ile Leu Pr #o Tyr Ile Gly Ala Ile         275           #       280           #       285 Phe Gly Met Leu Ile Ile Ser Thr Leu Ser As #p Arg Thr Gly Lys Arg     290               #   295               #   300 Lys Val Phe Val Ala Leu Pro Leu Ala Cys Ph #e Ala Ile Cys Met Ala 305                 3 #10                 3 #15                 3 #20 Leu Ser Val Leu Leu Lys Asp His Ile Trp Tr #p Ser Tyr Ala Ala Leu                 325   #               330   #               335 Val Gly Cys Gly Val Phe Thr Gln Ala Ala Al #a Gly Val Phe Trp Thr             340       #           345       #           350 Ile Pro Pro Lys Leu Phe Asn Ala Glu Met Al #a Gly Gly Ala Arg Gly         355           #       360           #       365 Val Ile Asn Ala Leu Gly Asn Leu Gly Gly Ph #e Cys Gly Pro Tyr Met     370               #   375               #   380 Val Gly Val Leu Ile Thr Leu Phe Ser Lys As #p Val Gly Val Tyr Ser 385                 3 #90                 3 #95                 4 #00 Leu Ala Val Ser Leu Ala Ser Ala Ser Val Le #u Ala Leu Met Leu Pro                 405   #               410   #               415 Asn Arg Cys Asp Gln Lys Ala Gly Ala Glu             420       #           425 <210> SEQ ID NO 5 <211> LENGTH: 1478 <212> TYPE: DNA <213> ORGANISM: Klebsiella oxytoca <220> FEATURE: <221> NAME/KEY: CDS <222> LOCATION: (73)...(1353) <400> SEQUENCE: 5 ttgcccgccg ccgctgctca gaccatcgat cttttctatg atgagcgtca cc #tcactcac     60 agaggcaaac ct atg aat agt tca acg aat gca aca # aaa cgc tgg tgg tac    111               Met Asn Se #r Ser Thr Asn Ala Thr Lys Arg Trp Trp Tyr                1    #            5       #             10 atc atg cct atc gtg ttt atc acg tat agc ct #g gcg tac ctc gac cgc      159 Ile Met Pro Ile Val Phe Ile Thr Tyr Ser Le #u Ala Tyr Leu Asp Arg      15              #     20              #     25 gct aac ttc agc ttc gct tcg gcg gcc gga at #t act gaa gac ctg ggg      207 Ala Asn Phe Ser Phe Ala Ser Ala Ala Gly Il #e Thr Glu Asp Leu Gly  30                  # 35                  # 40                  # 45 atc acc aaa ggt atc tcc tcc ctt ctg ggg gc #g ctg ttc ttc ctc ggc      255 Ile Thr Lys Gly Ile Ser Ser Leu Leu Gly Al #a Leu Phe Phe Leu Gly                  50  #                 55  #                 60 tac ttc ttc ttt cag atc ccc ggc gcg att ta #t gcc gaa cgc cgc agc      303 Tyr Phe Phe Phe Gln Ile Pro Gly Ala Ile Ty #r Ala Glu Arg Arg Ser              65      #             70      #             75 gta cgt aaa ctc att ttc atc tgc ctg atc ct #g tgg ggt gcc tgc gcc      351 Val Arg Lys Leu Ile Phe Ile Cys Leu Ile Le #u Trp Gly Ala Cys Ala          80          #         85          #         90 tca ctc gac cgg gat ggt gca caa tat tcc cg #c gct ggg cgg gcg atc      399 Ser Leu Asp Arg Asp Gly Ala Gln Tyr Ser Ar #g Ala Gly Arg Ala Ile      95              #    100              #    105 cgc ttt atc ctt ggc gtg gtc gag gcc gca gt #c atg ccg gcg atg ctg      447 Arg Phe Ile Leu Gly Val Val Glu Ala Ala Va #l Met Pro Ala Met Leu 110                 1 #15                 1 #20                 1 #25 ata tac atc agc aac tgg ttt acc aaa tcc ga #a cgc tcg cgc gcc aat      495 Ile Tyr Ile Ser Asn Trp Phe Thr Lys Ser Gl #u Arg Ser Arg Ala Asn                 130   #               135   #               140 acc ttc ctg atc ctc ggc aac ccg gtg acg gt #g ctg tgg atg tcg gtg      543 Thr Phe Leu Ile Leu Gly Asn Pro Val Thr Va #l Leu Trp Met Ser Val             145       #           150       #           155 gtc tcc ggc tac ctg att cag gct ttc ggc tg #g cgg gag atg ttt att      591 Val Ser Gly Tyr Leu Ile Gln Ala Phe Gly Tr #p Arg Glu Met Phe Ile         160           #       165           #       170 att gaa ggc gtt ccg gcg gtg att tgg gcc tt #c tgc tgg tgg gtg ctg      639 Ile Glu Gly Val Pro Ala Val Ile Trp Ala Ph #e Cys Trp Trp Val Leu     175               #   180               #   185 gta aaa gat aaa ccg tct cag gtc aac tgg ct #g gcg gaa agc gaa aag      687 Val Lys Asp Lys Pro Ser Gln Val Asn Trp Le #u Ala Glu Ser Glu Lys 190                 1 #95                 2 #00                 2 #05 gcc gca ttg cag gag cag ctg gag cgc gaa ca #g cag ggt atc aaa ccg      735 Ala Ala Leu Gln Glu Gln Leu Glu Arg Glu Gl #n Gln Gly Ile Lys Pro                 210   #               215   #               220 gtg cgc aac tac ggt gag gcc ttc cgc tcg cg #t aac gtg gtc ctg ctg      783 Val Arg Asn Tyr Gly Glu Ala Phe Arg Ser Ar #g Asn Val Val Leu Leu             225       #           230       #           235 tgc atg caa tat ttc gcc tgg agc atc ggg gt #t tac ggt ttc gtg ctg      831 Cys Met Gln Tyr Phe Ala Trp Ser Ile Gly Va #l Tyr Gly Phe Val Leu         240           #       245           #       250 tgg ctg ccg tca att atc cgc agc ggc ggc ga #g aat atg ggc atg gtc      879 Trp Leu Pro Ser Ile Ile Arg Ser Gly Gly Gl #u Asn Met Gly Met Val     255               #   260               #   265 gag gtc ggc tgg ctc tca tcc gtc ccc tac ct #g gcg gca acc atc gcc      927 Glu Val Gly Trp Leu Ser Ser Val Pro Tyr Le #u Ala Ala Thr Ile Ala 270                 2 #75                 2 #80                 2 #85 atg atc gtg gtc tcc tgg gcc tcc gat aaa at #g cag aac cgc aag cta      975 Met Ile Val Val Ser Trp Ala Ser Asp Lys Me #t Gln Asn Arg Lys Leu                 290   #               295   #               300 ttc gtc tgg ccg ctg ctg ctg att gcc gcc tt #c gcg ttt att ggc tcc     1023 Phe Val Trp Pro Leu Leu Leu Ile Ala Ala Ph #e Ala Phe Ile Gly Ser             305       #           310       #           315 tgg gcc gtc ggc gct aac cat ttc tgg gtc tc #t tat acc ctg ctg gtc     1071 Trp Ala Val Gly Ala Asn His Phe Trp Val Se #r Tyr Thr Leu Leu Val         320           #       325           #       330 att gcc ggc gcg gcg atg tac gcc ccc tac gg #g ccg ttc ttc gcc atc     1119 Ile Ala Gly Ala Ala Met Tyr Ala Pro Tyr Gl #y Pro Phe Phe Ala Ile     335               #   340               #   345 att ccc gag atg ctg ccg cgt aac gtc gcc gg #g ggc gcc atg gcg ctg     1167 Ile Pro Glu Met Leu Pro Arg Asn Val Ala Gl #y Gly Ala Met Ala Leu 350                 3 #55                 3 #60                 3 #65 att aac agc atg ggc gcg ctg ggt tca ttc tt #t ggc tca tgg ttt gtc     1215 Ile Asn Ser Met Gly Ala Leu Gly Ser Phe Ph #e Gly Ser Trp Phe Val                 370   #               375   #               380 ggc tac ctg aac ggc acc acc ggc agc ccg tc #a gcc tcg tac att ttt     1263 Gly Tyr Leu Asn Gly Thr Thr Gly Ser Pro Se #r Ala Ser Tyr Ile Phe             385       #           390       #           395 atg gga gtg gcg ctt ttc gtc tcg gta tgg ct #t act ttg att gtt aag     1311 Met Gly Val Ala Leu Phe Val Ser Val Trp Le #u Thr Leu Ile Val Lys         400           #       405           #       410 cct gct aat aat caa aaa ctt ccg ctc ggc gc #a cgt cac gcc              #1353 Pro Ala Asn Asn Gln Lys Leu Pro Leu Gly Al #a Arg His Ala     415               #   420               #   425 tgaaacatta acgcaacgga gaaccgcatg aagccgtcag tcattctcta ca #aaacgctt   1413 cccgacgacc tgcaacaagc gtctggaaca acactttacc gtcacgcagg tg #aaaaacct   1473 gcgtt                  #                   #                   #          1478 <210> SEQ ID NO 6 <211> LENGTH: 427 <212> TYPE: PRT <213> ORGANISM: Klebsiella oxytoca <400> SEQUENCE: 6 Met Asn Ser Ser Thr Asn Ala Thr Lys Arg Tr #p Trp Tyr Ile Met Pro  1               5   #                10   #                15 Ile Val Phe Ile Thr Tyr Ser Leu Ala Tyr Le #u Asp Arg Ala Asn Phe             20       #            25       #            30 Ser Phe Ala Ser Ala Ala Gly Ile Thr Glu As #p Leu Gly Ile Thr Lys         35           #        40           #        45 Gly Ile Ser Ser Leu Leu Gly Ala Leu Phe Ph #e Leu Gly Tyr Phe Phe     50               #    55               #    60 Phe Gln Ile Pro Gly Ala Ile Tyr Ala Glu Ar #g Arg Ser Val Arg Lys 65                   #70                   #75                   #80 Leu Ile Phe Ile Cys Leu Ile Leu Trp Gly Al #a Cys Ala Ser Leu Asp                 85   #                90   #                95 Arg Asp Gly Ala Gln Tyr Ser Arg Ala Gly Ar #g Ala Ile Arg Phe Ile             100       #           105       #           110 Leu Gly Val Val Glu Ala Ala Val Met Pro Al #a Met Leu Ile Tyr Ile         115           #       120           #       125 Ser Asn Trp Phe Thr Lys Ser Glu Arg Ser Ar #g Ala Asn Thr Phe Leu     130               #   135               #   140 Ile Leu Gly Asn Pro Val Thr Val Leu Trp Me #t Ser Val Val Ser Gly 145                 1 #50                 1 #55                 1 #60 Tyr Leu Ile Gln Ala Phe Gly Trp Arg Glu Me #t Phe Ile Ile Glu Gly                 165   #               170   #               175 Val Pro Ala Val Ile Trp Ala Phe Cys Trp Tr #p Val Leu Val Lys Asp             180       #           185       #           190 Lys Pro Ser Gln Val Asn Trp Leu Ala Glu Se #r Glu Lys Ala Ala Leu         195           #       200           #       205 Gln Glu Gln Leu Glu Arg Glu Gln Gln Gly Il #e Lys Pro Val Arg Asn     210               #   215               #   220 Tyr Gly Glu Ala Phe Arg Ser Arg Asn Val Va #l Leu Leu Cys Met Gln 225                 2 #30                 2 #35                 2 #40 Tyr Phe Ala Trp Ser Ile Gly Val Tyr Gly Ph #e Val Leu Trp Leu Pro                 245   #               250   #               255 Ser Ile Ile Arg Ser Gly Gly Glu Asn Met Gl #y Met Val Glu Val Gly             260       #           265       #           270 Trp Leu Ser Ser Val Pro Tyr Leu Ala Ala Th #r Ile Ala Met Ile Val         275           #       280           #       285 Val Ser Trp Ala Ser Asp Lys Met Gln Asn Ar #g Lys Leu Phe Val Trp     290               #   295               #   300 Pro Leu Leu Leu Ile Ala Ala Phe Ala Phe Il #e Gly Ser Trp Ala Val 305                 3 #10                 3 #15                 3 #20 Gly Ala Asn His Phe Trp Val Ser Tyr Thr Le #u Leu Val Ile Ala Gly                 325   #               330   #               335 Ala Ala Met Tyr Ala Pro Tyr Gly Pro Phe Ph #e Ala Ile Ile Pro Glu             340       #           345       #           350 Met Leu Pro Arg Asn Val Ala Gly Gly Ala Me #t Ala Leu Ile Asn Ser         355           #       360           #       365 Met Gly Ala Leu Gly Ser Phe Phe Gly Ser Tr #p Phe Val Gly Tyr Leu     370               #   375               #   380 Asn Gly Thr Thr Gly Ser Pro Ser Ala Ser Ty #r Ile Phe Met Gly Val 385                 3 #90                 3 #95                 4 #00 Ala Leu Phe Val Ser Val Trp Leu Thr Leu Il #e Val Lys Pro Ala Asn                 405   #               410   #               415 Asn Gln Lys Leu Pro Leu Gly Ala Arg His Al #a             420       #           425 <210> SEQ ID NO 7 <211> LENGTH: 1600 <212> TYPE: DNA <213> ORGANISM: Pantoea citrea <220> FEATURE: <221> NAME/KEY: CDS <222> LOCATION: (214)...(1521) <400> SEQUENCE: 7 tctgagcttt tcccgacctt atccctgtca gatccctgcc tggttcacga ac #cttgtaac     60 acactttctt aacatgccct tacgtgaccc tgatcccaca ctgtcagtgc aa #aaacacgt    120 tttatagctc ctgataagca cagttcgcag cgcgtaactg cacccgcagg gt #tctgcttt    180 gcgtcaactg acaaaacaga aaggggatat atc atg caa aaa tc #a cag ccg gga     234                    #                   # Met Gln Lys Ser Gln Pro Gly                    #                   #  1               5 acc cgc tgg ttt cgg att att gtg ccg atc ct #g ata gcc tgc atc atg      282 Thr Arg Trp Phe Arg Ile Ile Val Pro Ile Le #u Ile Ala Cys Ile Met          10          #         15          #         20 tcg ttt atg gat cgg gta aat atc agt ttc gc #a ttg ccg ggc ggt atg      330 Ser Phe Met Asp Arg Val Asn Ile Ser Phe Al #a Leu Pro Gly Gly Met      25              #     30              #     35 gag cag gat ctg ctg atg tcc agc cag atg gc #c ggg gta gtt agc ggt      378 Glu Gln Asp Leu Leu Met Ser Ser Gln Met Al #a Gly Val Val Ser Gly  40                  # 45                  # 50                  # 55 att ttc ttt att ggt tat ctg ttt ttg cag gt #t cct ggt ggg cat atc      426 Ile Phe Phe Ile Gly Tyr Leu Phe Leu Gln Va #l Pro Gly Gly His Ile                  60  #                 65  #                 70 gca gta cgt ggc agt ggt aaa cgt ttt att gc #c tgg tcg ctt gtt gcc      474 Ala Val Arg Gly Ser Gly Lys Arg Phe Ile Al #a Trp Ser Leu Val Ala              75      #             80      #             85 tgg gcc gtt gtt tct gtc gct acc ggg ttt gt #g act cat cag tac cag      522 Trp Ala Val Val Ser Val Ala Thr Gly Phe Va #l Thr His Gln Tyr Gln          90          #         95          #        100 ctg ttg att tta cgt ttt gca ctg ggg gtc tc #t gaa ggt ggg atg ttg      570 Leu Leu Ile Leu Arg Phe Ala Leu Gly Val Se #r Glu Gly Gly Met Leu     105               #   110               #   115 ccg gta gtt ctg aca atg gtc agc aac tgg tt #t cct gaa aaa gag ctg      618 Pro Val Val Leu Thr Met Val Ser Asn Trp Ph #e Pro Glu Lys Glu Leu 120                 1 #25                 1 #30                 1 #35 ggg cgt gct aat gca ttt gtc atg atg ttc gc #c ccg ctt ggc gga atg      666 Gly Arg Ala Asn Ala Phe Val Met Met Phe Al #a Pro Leu Gly Gly Met                 140   #               145   #               150 att acc gcc cct gtc tcc gga tgg att att gc #a ctg cta gac tgg cgc      714 Ile Thr Ala Pro Val Ser Gly Trp Ile Ile Al #a Leu Leu Asp Trp Arg             155       #           160       #           165 tgg tta ttt att atc gaa gga tta ctg tcg gt #a gtg gtt ctg gca gtc      762 Trp Leu Phe Ile Ile Glu Gly Leu Leu Ser Va #l Val Val Leu Ala Val         170           #       175           #       180 tgg tgg ctg atg gtc agt gac cgc cct gaa ga #t gcc cgt tgg ctg ccg      810 Trp Trp Leu Met Val Ser Asp Arg Pro Glu As #p Ala Arg Trp Leu Pro     185               #   190               #   195 gca gca gaa cgg gaa tat ctg ctg cgc gaa at #g gcc cgt gac aag gcc      858 Ala Ala Glu Arg Glu Tyr Leu Leu Arg Glu Me #t Ala Arg Asp Lys Ala 200                 2 #05                 2 #10                 2 #15 gag cgg agc aaa ctc cct ccg atc agt cat gc #t ccc ctg caa gag gtt      906 Glu Arg Ser Lys Leu Pro Pro Ile Ser His Al #a Pro Leu Gln Glu Val                 220   #               225   #               230 ttc cat aac ccg ggc ctg atg aag tta gtg at #t ctg aac ttt ttc tat      954 Phe His Asn Pro Gly Leu Met Lys Leu Val Il #e Leu Asn Phe Phe Tyr             235       #           240       #           245 cag aca ggt gat tac gga tac act ctg tgg ct #g ccg act att atc aaa     1002 Gln Thr Gly Asp Tyr Gly Tyr Thr Leu Trp Le #u Pro Thr Ile Ile Lys         250           #       255           #       260 aac ctg acc gga gct agt att ggt aac gtc gg #t ttg ctg aca gtg cta     1050 Asn Leu Thr Gly Ala Ser Ile Gly Asn Val Gl #y Leu Leu Thr Val Leu     265               #   270               #   275 cct ttt atc gcg acg tta tca ggg att tat gt #c gtc tct tac ctg agc     1098 Pro Phe Ile Ala Thr Leu Ser Gly Ile Tyr Va #l Val Ser Tyr Leu Ser 280                 2 #85                 2 #90                 2 #95 gat aaa acc ggc aaa cgt cgg caa tgg gtg at #g att tct ctg ttc tgt     1146 Asp Lys Thr Gly Lys Arg Arg Gln Trp Val Me #t Ile Ser Leu Phe Cys                 300   #               305   #               310 ttt gcg gcc tgc ctg ttg gcc tca gtc ctg tt #a cgt gaa ttt gtg ctg     1194 Phe Ala Ala Cys Leu Leu Ala Ser Val Leu Le #u Arg Glu Phe Val Leu             315       #           320       #           325 gct gct tat ctg gct ctg gtg gct tgc ggc tt #t ttc ctg aaa gca gcc     1242 Ala Ala Tyr Leu Ala Leu Val Ala Cys Gly Ph #e Phe Leu Lys Ala Ala         330           #       335           #       340 acc agc ccg ttc tgg agt att ccg gga cgt at #t gca ccg ccg gaa gca     1290 Thr Ser Pro Phe Trp Ser Ile Pro Gly Arg Il #e Ala Pro Pro Glu Ala     345               #   350               #   355 gcc ggt agt gcc cgt ggt gta att aac gga ct #g ggg aat ctg ggc ggt     1338 Ala Gly Ser Ala Arg Gly Val Ile Asn Gly Le #u Gly Asn Leu Gly Gly 360                 3 #65                 3 #70                 3 #75 ttc tgc ggc ccc tgg ctg gtc gga tta atg at #c tac ctg tac gga cag     1386 Phe Cys Gly Pro Trp Leu Val Gly Leu Met Il #e Tyr Leu Tyr Gly Gln                 380   #               385   #               390 aat gca gcc gtt gtt act ctg gca ggc tct ct #g atc att gcc ggg att     1434 Asn Ala Ala Val Val Thr Leu Ala Gly Ser Le #u Ile Ile Ala Gly Ile             395       #           400       #           405 att gcg gca tta ctg cca acg cag tgt gat ct #g cgc ccg gca gag gca     1482 Ile Ala Ala Leu Leu Pro Thr Gln Cys Asp Le #u Arg Pro Ala Glu Ala         410           #       415           #       420 cgg cag cag aat ttc acc cca cgt att cat ga #t gcc aaa taatactgtc      1531 Arg Gln Gln Asn Phe Thr Pro Arg Ile His As #p Ala Lys     425               #   430               #   435 acccggtaac gctgttgccg ggtgcagcct tcacctttca gggcgtattt tt #ctgataac   1591 cccgtgtaa                 #                   #                   #       1600 <210> SEQ ID NO 8 <211> LENGTH: 436 <212> TYPE: PRT <213> ORGANISM: Pantoea citrea <400> SEQUENCE: 8 Met Gln Lys Ser Gln Pro Gly Thr Arg Trp Ph #e Arg Ile Ile Val Pro  1               5   #                10   #                15 Ile Leu Ile Ala Cys Ile Met Ser Phe Met As #p Arg Val Asn Ile Ser             20       #            25       #            30 Phe Ala Leu Pro Gly Gly Met Glu Gln Asp Le #u Leu Met Ser Ser Gln         35           #        40           #        45 Met Ala Gly Val Val Ser Gly Ile Phe Phe Il #e Gly Tyr Leu Phe Leu     50               #    55               #    60 Gln Val Pro Gly Gly His Ile Ala Val Arg Gl #y Ser Gly Lys Arg Phe 65                   #70                   #75                   #80 Ile Ala Trp Ser Leu Val Ala Trp Ala Val Va #l Ser Val Ala Thr Gly                 85   #                90   #                95 Phe Val Thr His Gln Tyr Gln Leu Leu Ile Le #u Arg Phe Ala Leu Gly             100       #           105       #           110 Val Ser Glu Gly Gly Met Leu Pro Val Val Le #u Thr Met Val Ser Asn         115           #       120           #       125 Trp Phe Pro Glu Lys Glu Leu Gly Arg Ala As #n Ala Phe Val Met Met     130               #   135               #   140 Phe Ala Pro Leu Gly Gly Met Ile Thr Ala Pr #o Val Ser Gly Trp Ile 145                 1 #50                 1 #55                 1 #60 Ile Ala Leu Leu Asp Trp Arg Trp Leu Phe Il #e Ile Glu Gly Leu Leu                 165   #               170   #               175 Ser Val Val Val Leu Ala Val Trp Trp Leu Me #t Val Ser Asp Arg Pro             180       #           185       #           190 Glu Asp Ala Arg Trp Leu Pro Ala Ala Glu Ar #g Glu Tyr Leu Leu Arg         195           #       200           #       205 Glu Met Ala Arg Asp Lys Ala Glu Arg Ser Ly #s Leu Pro Pro Ile Ser     210               #   215               #   220 His Ala Pro Leu Gln Glu Val Phe His Asn Pr #o Gly Leu Met Lys Leu 225                 2 #30                 2 #35                 2 #40 Val Ile Leu Asn Phe Phe Tyr Gln Thr Gly As #p Tyr Gly Tyr Thr Leu                 245   #               250   #               255 Trp Leu Pro Thr Ile Ile Lys Asn Leu Thr Gl #y Ala Ser Ile Gly Asn             260       #           265       #           270 Val Gly Leu Leu Thr Val Leu Pro Phe Ile Al #a Thr Leu Ser Gly Ile         275           #       280           #       285 Tyr Val Val Ser Tyr Leu Ser Asp Lys Thr Gl #y Lys Arg Arg Gln Trp     290               #   295               #   300 Val Met Ile Ser Leu Phe Cys Phe Ala Ala Cy #s Leu Leu Ala Ser Val 305                 3 #10                 3 #15                 3 #20 Leu Leu Arg Glu Phe Val Leu Ala Ala Tyr Le #u Ala Leu Val Ala Cys                 325   #               330   #               335 Gly Phe Phe Leu Lys Ala Ala Thr Ser Pro Ph #e Trp Ser Ile Pro Gly             340       #           345       #           350 Arg Ile Ala Pro Pro Glu Ala Ala Gly Ser Al #a Arg Gly Val Ile Asn         355           #       360           #       365 Gly Leu Gly Asn Leu Gly Gly Phe Cys Gly Pr #o Trp Leu Val Gly Leu     370               #   375               #   380 Met Ile Tyr Leu Tyr Gly Gln Asn Ala Ala Va #l Val Thr Leu Ala Gly 385                 3 #90                 3 #95                 4 #00 Ser Leu Ile Ile Ala Gly Ile Ile Ala Ala Le #u Leu Pro Thr Gln Cys                 405   #               410   #               415 Asp Leu Arg Pro Ala Glu Ala Arg Gln Gln As #n Phe Thr Pro Arg Ile             420       #           425       #           430 His Asp Ala Lys         435 <210> SEQ ID NO 9 <211> LENGTH: 1500 <212> TYPE: DNA <213> ORGANISM: Pantoea citrea <220> FEATURE: <221> NAME/KEY: CDS <222> LOCATION: (154)...(1440) <400> SEQUENCE: 9 tcagctcagg cctcggattt cgttaacggt catgtcttat ttgtcgacgg cg #gaatgctg     60 gcctcagtat aaaatacagg ggcagacgga atcagagttt gccctgaaga ta #tcttactg    120 gttgcccctt cggcacacac aggatgttcc ccc atg aat aca ag #c aga aaa ctg     174                    #                   # Met Asn Thr Ser Arg Lys Leu                    #                   #  1               5 ccg gtg aaa cgc tgg tgg tat tta atg ccg gt #g att ttt att act tac      222 Pro Val Lys Arg Trp Trp Tyr Leu Met Pro Va #l Ile Phe Ile Thr Tyr          10          #         15          #         20 agc ctg gca tat ctg gat cgg gcc aac tac gg #c ttt gct gct gcc tct      270 Ser Leu Ala Tyr Leu Asp Arg Ala Asn Tyr Gl #y Phe Ala Ala Ala Ser      25              #     30              #     35 ggg att gaa gca gat ctt gga att agc cgt gg #c acc tcc tct ctg att      318 Gly Ile Glu Ala Asp Leu Gly Ile Ser Arg Gl #y Thr Ser Ser Leu Ile  40                  # 45                  # 50                  # 55 gga gca ctg ttc ttt ctc ggc tac ttc att tt #t cag gtg ccc ggg gca      366 Gly Ala Leu Phe Phe Leu Gly Tyr Phe Ile Ph #e Gln Val Pro Gly Ala                  60  #                 65  #                 70 att tat gca gtg aaa cgc agt gtc cgt aaa ct #g gtg ttt acc agc ctg      414 Ile Tyr Ala Val Lys Arg Ser Val Arg Lys Le #u Val Phe Thr Ser Leu              75      #             80      #             85 ctg ttg tgg gga ttt tgt gcc gct gcg acc gg #a ctt atc agc aat att      462 Leu Leu Trp Gly Phe Cys Ala Ala Ala Thr Gl #y Leu Ile Ser Asn Ile          90          #         95          #        100 ccg gct ctg atg gtg atc cgc ttt gtt ctg gg #t gtt gtt gaa gcc gca      510 Pro Ala Leu Met Val Ile Arg Phe Val Leu Gl #y Val Val Glu Ala Ala     105               #   110               #   115 gtg atg cca gcg atg ctg att tac atc agc aa #c tgg ttc acc cgt cag      558 Val Met Pro Ala Met Leu Ile Tyr Ile Ser As #n Trp Phe Thr Arg Gln 120                 1 #25                 1 #30                 1 #35 gaa cgt tca cgg gct aat acc ttt ctg gta tt #a ggt aac ccg gtc acg      606 Glu Arg Ser Arg Ala Asn Thr Phe Leu Val Le #u Gly Asn Pro Val Thr                 140   #               145   #               150 gtg tta tgg atg tct att gtt tcc gga tat ct #g atc aat gct ttt ggc      654 Val Leu Trp Met Ser Ile Val Ser Gly Tyr Le #u Ile Asn Ala Phe Gly             155       #           160       #           165 tgg cgg gaa atg ttt att ttc gag ggt gtg cc #t gcc tta atc tgg gcc      702 Trp Arg Glu Met Phe Ile Phe Glu Gly Val Pr #o Ala Leu Ile Trp Ala         170           #       175           #       180 atc ttc tgg tgg ttt att gtc cgg gac aaa cc #g gag cag gtg agc tgg      750 Ile Phe Trp Trp Phe Ile Val Arg Asp Lys Pr #o Glu Gln Val Ser Trp     185               #   190               #   195 ctg aca gaa aca gaa aag cag caa ctg gcc ag #t gca atg gct gaa gag      798 Leu Thr Glu Thr Glu Lys Gln Gln Leu Ala Se #r Ala Met Ala Glu Glu 200                 2 #05                 2 #10                 2 #15 cag cag gca ata cca ccg atg cgc aat gtg cc #g cag gcc ctg cgt tcc      846 Gln Gln Ala Ile Pro Pro Met Arg Asn Val Pr #o Gln Ala Leu Arg Ser                 220   #               225   #               230 cgc aat gtg gtg gta ctg tgc ctg tta cac gc #t ctg tgg agc atc gga      894 Arg Asn Val Val Val Leu Cys Leu Leu His Al #a Leu Trp Ser Ile Gly             235       #           240       #           245 gtg tat ggt ttt atg atg tgg atg cca tcg at #a ctg cgt agc gct gca      942 Val Tyr Gly Phe Met Met Trp Met Pro Ser Il #e Leu Arg Ser Ala Ala         250           #       255           #       260 tca atg gac att gtc cgg gta ggc tgg ctg gc #c gca gtt ccg tat ctg      990 Ser Met Asp Ile Val Arg Val Gly Trp Leu Al #a Ala Val Pro Tyr Leu     265               #   270               #   275 gcc gcg att att act atg ctg gtg att tca tg #g ctg tca gat aaa acc     1038 Ala Ala Ile Ile Thr Met Leu Val Ile Ser Tr #p Leu Ser Asp Lys Thr 280                 2 #85                 2 #90                 2 #95 ggg ctg cgt cgg ctt ttt atc tgg cca tta tt #g ctg att gcg tca gtt     1086 Gly Leu Arg Arg Leu Phe Ile Trp Pro Leu Le #u Leu Ile Ala Ser Val                 300   #               305   #               310 act ttt ttt ggg tcc tgg tta ctt ggg agc ta #c tca ttc tgg ttt tcc     1134 Thr Phe Phe Gly Ser Trp Leu Leu Gly Ser Ty #r Ser Phe Trp Phe Ser             315       #           320       #           325 tat ggc ttg ctg gta ctg gct gct gct tgt at #g tat gcc ccg tat gga     1182 Tyr Gly Leu Leu Val Leu Ala Ala Ala Cys Me #t Tyr Ala Pro Tyr Gly         330           #       335           #       340 ccg ttt ttt gcg ttg att cct gaa ttg ctg cc #a aaa aat gtg gcg ggg     1230 Pro Phe Phe Ala Leu Ile Pro Glu Leu Leu Pr #o Lys Asn Val Ala Gly     345               #   350               #   355 att tct atc ggg tta att aac tgt tgc ggg gc #g ctg gga gct ttt gcc     1278 Ile Ser Ile Gly Leu Ile Asn Cys Cys Gly Al #a Leu Gly Ala Phe Ala 360                 3 #65                 3 #70                 3 #75 gga gcc tgg ctg gtg ggc tat ctt aat ggt ct #g acc ggt ggt ccg ggg     1326 Gly Ala Trp Leu Val Gly Tyr Leu Asn Gly Le #u Thr Gly Gly Pro Gly                 380   #               385   #               390 gct tct tac act ttt atg gcc att gca ttg ct #g gtt tct gta ggg ttg     1374 Ala Ser Tyr Thr Phe Met Ala Ile Ala Leu Le #u Val Ser Val Gly Leu             395       #           400       #           405 gtg ttt ttc ctg aaa gtc cct tca ggg aat tt #g gtc act cgt cgg ttg     1422 Val Phe Phe Leu Lys Val Pro Ser Gly Asn Le #u Val Thr Arg Arg Leu         410           #       415           #       420 ctg aaa ggt gat gca aag taaaaggaat agcgatgaaa cg #gaacagga            1470 Leu Lys Gly Asp Ala Lys     425 tgtctttgca ggatattgcg gacctcgccg          #                   #         1500 <210> SEQ ID NO 10 <211> LENGTH: 429 <212> TYPE: PRT <213> ORGANISM: Pantoea citrea <400> SEQUENCE: 10 Met Asn Thr Ser Arg Lys Leu Pro Val Lys Ar #g Trp Trp Tyr Leu Met  1               5   #                10   #                15 Pro Val Ile Phe Ile Thr Tyr Ser Leu Ala Ty #r Leu Asp Arg Ala Asn             20       #            25       #            30 Tyr Gly Phe Ala Ala Ala Ser Gly Ile Glu Al #a Asp Leu Gly Ile Ser         35           #        40           #        45 Arg Gly Thr Ser Ser Leu Ile Gly Ala Leu Ph #e Phe Leu Gly Tyr Phe     50               #    55               #    60 Ile Phe Gln Val Pro Gly Ala Ile Tyr Ala Va #l Lys Arg Ser Val Arg 65                   #70                   #75                   #80 Lys Leu Val Phe Thr Ser Leu Leu Leu Trp Gl #y Phe Cys Ala Ala Ala                 85   #                90   #                95 Thr Gly Leu Ile Ser Asn Ile Pro Ala Leu Me #t Val Ile Arg Phe Val             100       #           105       #           110 Leu Gly Val Val Glu Ala Ala Val Met Pro Al #a Met Leu Ile Tyr Ile         115           #       120           #       125 Ser Asn Trp Phe Thr Arg Gln Glu Arg Ser Ar #g Ala Asn Thr Phe Leu     130               #   135               #   140 Val Leu Gly Asn Pro Val Thr Val Leu Trp Me #t Ser Ile Val Ser Gly 145                 1 #50                 1 #55                 1 #60 Tyr Leu Ile Asn Ala Phe Gly Trp Arg Glu Me #t Phe Ile Phe Glu Gly                 165   #               170   #               175 Val Pro Ala Leu Ile Trp Ala Ile Phe Trp Tr #p Phe Ile Val Arg Asp             180       #           185       #           190 Lys Pro Glu Gln Val Ser Trp Leu Thr Glu Th #r Glu Lys Gln Gln Leu         195           #       200           #       205 Ala Ser Ala Met Ala Glu Glu Gln Gln Ala Il #e Pro Pro Met Arg Asn     210               #   215               #   220 Val Pro Gln Ala Leu Arg Ser Arg Asn Val Va #l Val Leu Cys Leu Leu 225                 2 #30                 2 #35                 2 #40 His Ala Leu Trp Ser Ile Gly Val Tyr Gly Ph #e Met Met Trp Met Pro                 245   #               250   #               255 Ser Ile Leu Arg Ser Ala Ala Ser Met Asp Il #e Val Arg Val Gly Trp             260       #           265       #           270 Leu Ala Ala Val Pro Tyr Leu Ala Ala Ile Il #e Thr Met Leu Val Ile         275           #       280           #       285 Ser Trp Leu Ser Asp Lys Thr Gly Leu Arg Ar #g Leu Phe Ile Trp Pro     290               #   295               #   300 Leu Leu Leu Ile Ala Ser Val Thr Phe Phe Gl #y Ser Trp Leu Leu Gly 305                 3 #10                 3 #15                 3 #20 Ser Tyr Ser Phe Trp Phe Ser Tyr Gly Leu Le #u Val Leu Ala Ala Ala                 325   #               330   #               335 Cys Met Tyr Ala Pro Tyr Gly Pro Phe Phe Al #a Leu Ile Pro Glu Leu             340       #           345       #           350 Leu Pro Lys Asn Val Ala Gly Ile Ser Ile Gl #y Leu Ile Asn Cys Cys         355           #       360           #       365 Gly Ala Leu Gly Ala Phe Ala Gly Ala Trp Le #u Val Gly Tyr Leu Asn     370               #   375               #   380 Gly Leu Thr Gly Gly Pro Gly Ala Ser Tyr Th #r Phe Met Ala Ile Ala 385                 3 #90                 3 #95                 4 #00 Leu Leu Val Ser Val Gly Leu Val Phe Phe Le #u Lys Val Pro Ser Gly                 405   #               410   #               415 Asn Leu Val Thr Arg Arg Leu Leu Lys Gly As #p Ala Lys             420       #           425 <210> SEQ ID NO 11 <211> LENGTH: 1500 <212> TYPE: DNA <213> ORGANISM: Klebsiella oxytoca <220> FEATURE: <221> NAME/KEY: CDS <222> LOCATION: (70)...(1386) <400> SEQUENCE: 11 ctaaaacaag cacaataata ataatcacct tcatcaccag aatattttta at #attacgag     60 actataaag atg aat ata acc tct aac tct aca acc # aaa gat ata ccg cgc    111           Met Asn Ile Thr Ser  #Asn Ser Thr Thr Lys Asp Ile Pro Arg            1        #        5           #         10 cag cgc tgg tta aga atc att ccg cct ata ct #g atc act tgt att att      159 Gln Arg Trp Leu Arg Ile Ile Pro Pro Ile Le #u Ile Thr Cys Ile Ile  15                  # 20                  # 25                  # 30 tct tat atg gac cgg gtc aat att gcc ttt gc #g atg ccc gga ggt atg      207 Ser Tyr Met Asp Arg Val Asn Ile Ala Phe Al #a Met Pro Gly Gly Met                  35  #                 40  #                 45 gat gcc gac tta ggt att tcc gcc acc atg gc #g ggg ctg gcg ggc ggt      255 Asp Ala Asp Leu Gly Ile Ser Ala Thr Met Al #a Gly Leu Ala Gly Gly              50      #             55      #             60 att ttc ttt atc ggt tat cta ttt tta cag gt #t ccc ggc ggg aaa att      303 Ile Phe Phe Ile Gly Tyr Leu Phe Leu Gln Va #l Pro Gly Gly Lys Ile          65          #         70          #         75 gcc gtt cac ggt agc ggt aag aaa ttt atc gg #c tgg tcg ctg gtc gcc      351 Ala Val His Gly Ser Gly Lys Lys Phe Ile Gl #y Trp Ser Leu Val Ala      80              #     85              #     90 tgg gcg gtc atc tcc gtg ctg acg ggg tta at #t acc aat cag tac cag      399 Trp Ala Val Ile Ser Val Leu Thr Gly Leu Il #e Thr Asn Gln Tyr Gln  95                  #100                  #105                  #110 ctg ctg gcc ctg cgc ttc tta ctg ggc gtg gc #g gaa ggc ggt atg ctg      447 Leu Leu Ala Leu Arg Phe Leu Leu Gly Val Al #a Glu Gly Gly Met Leu                 115   #               120   #               125 ccg gtc gtt ctc acg atg atc agt aac tgg tt #c ccc gac gct gaa cgc      495 Pro Val Val Leu Thr Met Ile Ser Asn Trp Ph #e Pro Asp Ala Glu Arg             130       #           135       #           140 ggt cgc gcc aac gcg att gtc att atg ttt gt #g ccg att gcc ggg att      543 Gly Arg Ala Asn Ala Ile Val Ile Met Phe Va #l Pro Ile Ala Gly Ile         145           #       150           #       155 atc acc gcc cca ctc tca ggc tgg att atc ac #g gtt ctc gac tgg cgc      591 Ile Thr Ala Pro Leu Ser Gly Trp Ile Ile Th #r Val Leu Asp Trp Arg     160               #   165               #   170 tgg ctg ttt att atc gaa ggt ttg ctc tcg ct #g gtt gtt ctg gtt ctg      639 Trp Leu Phe Ile Ile Glu Gly Leu Leu Ser Le #u Val Val Leu Val Leu 175                 1 #80                 1 #85                 1 #90 tgg gca tac acc atc tat gac cgt ccg cag ga #a gcg cgc tgg att tcc      687 Trp Ala Tyr Thr Ile Tyr Asp Arg Pro Gln Gl #u Ala Arg Trp Ile Ser                 195   #               200   #               205 gaa gca gag aag cgc tat ctg gtc gag acg ct #g gcc gcg gag caa aaa      735 Glu Ala Glu Lys Arg Tyr Leu Val Glu Thr Le #u Ala Ala Glu Gln Lys             210       #           215       #           220 gcc att gcc ggc acc gag gtg aaa aac gcc tc #t ctg agc gcc gtt ctc      783 Ala Ile Ala Gly Thr Glu Val Lys Asn Ala Se #r Leu Ser Ala Val Leu         225           #       230           #       235 tcc gac aaa acc atg tgg cag ctt atc gcc ct #g aac ttc ttc tac cag      831 Ser Asp Lys Thr Met Trp Gln Leu Ile Ala Le #u Asn Phe Phe Tyr Gln     240               #   245               #   250 acc ggc att tac ggc tac acc ctg tgg cta cc #c acc att ctg aaa gaa      879 Thr Gly Ile Tyr Gly Tyr Thr Leu Trp Leu Pr #o Thr Ile Leu Lys Glu 255                 2 #60                 2 #65                 2 #70 ttg acc cat agc agc atg ggg cag gtc ggc at #g ctt gcc att ctg ccg      927 Leu Thr His Ser Ser Met Gly Gln Val Gly Me #t Leu Ala Ile Leu Pro                 275   #               280   #               285 tac gtc ggc gcc att gct ggg atg ttc ctg tt #t tcc tcc ctt tca gac      975 Tyr Val Gly Ala Ile Ala Gly Met Phe Leu Ph #e Ser Ser Leu Ser Asp             290       #           295       #           300 cga acc ggt aaa cgc aag ctg ttc gtc tgc ct #g ccg ctg att ggc ttc     1023 Arg Thr Gly Lys Arg Lys Leu Phe Val Cys Le #u Pro Leu Ile Gly Phe         305           #       310           #       315 gct ctg tgc atg ttc ctg tcg gtg gcg ctg aa #a aac caa att tgg ctc     1071 Ala Leu Cys Met Phe Leu Ser Val Ala Leu Ly #s Asn Gln Ile Trp Leu     320               #   325               #   330 tcc tat gcc gcg ctg gtc ggc tgc gga ttc tt #c ctg caa tcg gcg gct     1119 Ser Tyr Ala Ala Leu Val Gly Cys Gly Phe Ph #e Leu Gln Ser Ala Ala 335                 3 #40                 3 #45                 3 #50 ggc gtg ttc tgg acc atc ccg gca cgt ctg tt #c agc gcg gaa atg gcg     1167 Gly Val Phe Trp Thr Ile Pro Ala Arg Leu Ph #e Ser Ala Glu Met Ala                 355   #               360   #               365 ggc ggc gcg cgc ggg gtt atc aac gcg ctt gg #c aac ctc ggc gga ttt     1215 Gly Gly Ala Arg Gly Val Ile Asn Ala Leu Gl #y Asn Leu Gly Gly Phe             370       #           375       #           380 tgt ggc cct tat gcg gtc ggg gtg ctg atc ac #g ttg tac agc aaa gac     1263 Cys Gly Pro Tyr Ala Val Gly Val Leu Ile Th #r Leu Tyr Ser Lys Asp         385           #       390           #       395 gct ggc gtc tat tgc ctg gcg atc tcc ctg gc #g ctg gcc gcg ctg atg     1311 Ala Gly Val Tyr Cys Leu Ala Ile Ser Leu Al #a Leu Ala Ala Leu Met     400               #   405               #   410 gcg ctg ctg ctg ccg gcg aaa tgc gat gcc gg #t gct gcg ccg gta aag     1359 Ala Leu Leu Leu Pro Ala Lys Cys Asp Ala Gl #y Ala Ala Pro Val Lys 415                 4 #20                 4 #25                 4 #30 acg ata aat cca cat aaa cgc act gcg taaactcga #g cccggcggcg           1406 Thr Ile Asn Pro His Lys Arg Thr Ala                 435 ctgcgcctgc cgggcctgcg aaatatgccg ggttcacccg gtaacaatga ga #tgcgaaag   1466 atgagcaaga aacaggcctt ctggctgggt attg        #                   #      1500 <210> SEQ ID NO 12 <211> LENGTH: 439 <212> TYPE: PRT <213> ORGANISM: Klebsiella oxytoca <400> SEQUENCE: 12 Met Asn Ile Thr Ser Asn Ser Thr Thr Lys As #p Ile Pro Arg Gln Arg  1               5   #                10   #                15 Trp Leu Arg Ile Ile Pro Pro Ile Leu Ile Th #r Cys Ile Ile Ser Tyr             20       #            25       #            30 Met Asp Arg Val Asn Ile Ala Phe Ala Met Pr #o Gly Gly Met Asp Ala         35           #        40           #        45 Asp Leu Gly Ile Ser Ala Thr Met Ala Gly Le #u Ala Gly Gly Ile Phe     50               #    55               #    60 Phe Ile Gly Tyr Leu Phe Leu Gln Val Pro Gl #y Gly Lys Ile Ala Val 65                   #70                   #75                   #80 His Gly Ser Gly Lys Lys Phe Ile Gly Trp Se #r Leu Val Ala Trp Ala                 85   #                90   #                95 Val Ile Ser Val Leu Thr Gly Leu Ile Thr As #n Gln Tyr Gln Leu Leu             100       #           105       #           110 Ala Leu Arg Phe Leu Leu Gly Val Ala Glu Gl #y Gly Met Leu Pro Val         115           #       120           #       125 Val Leu Thr Met Ile Ser Asn Trp Phe Pro As #p Ala Glu Arg Gly Arg     130               #   135               #   140 Ala Asn Ala Ile Val Ile Met Phe Val Pro Il #e Ala Gly Ile Ile Thr 145                 1 #50                 1 #55                 1 #60 Ala Pro Leu Ser Gly Trp Ile Ile Thr Val Le #u Asp Trp Arg Trp Leu                 165   #               170   #               175 Phe Ile Ile Glu Gly Leu Leu Ser Leu Val Va #l Leu Val Leu Trp Ala             180       #           185       #           190 Tyr Thr Ile Tyr Asp Arg Pro Gln Glu Ala Ar #g Trp Ile Ser Glu Ala         195           #       200           #       205 Glu Lys Arg Tyr Leu Val Glu Thr Leu Ala Al #a Glu Gln Lys Ala Ile     210               #   215               #   220 Ala Gly Thr Glu Val Lys Asn Ala Ser Leu Se #r Ala Val Leu Ser Asp 225                 2 #30                 2 #35                 2 #40 Lys Thr Met Trp Gln Leu Ile Ala Leu Asn Ph #e Phe Tyr Gln Thr Gly                 245   #               250   #               255 Ile Tyr Gly Tyr Thr Leu Trp Leu Pro Thr Il #e Leu Lys Glu Leu Thr             260       #           265       #           270 His Ser Ser Met Gly Gln Val Gly Met Leu Al #a Ile Leu Pro Tyr Val         275           #       280           #       285 Gly Ala Ile Ala Gly Met Phe Leu Phe Ser Se #r Leu Ser Asp Arg Thr     290               #   295               #   300 Gly Lys Arg Lys Leu Phe Val Cys Leu Pro Le #u Ile Gly Phe Ala Leu 305                 3 #10                 3 #15                 3 #20 Cys Met Phe Leu Ser Val Ala Leu Lys Asn Gl #n Ile Trp Leu Ser Tyr                 325   #               330   #               335 Ala Ala Leu Val Gly Cys Gly Phe Phe Leu Gl #n Ser Ala Ala Gly Val             340       #           345       #           350 Phe Trp Thr Ile Pro Ala Arg Leu Phe Ser Al #a Glu Met Ala Gly Gly         355           #       360           #       365 Ala Arg Gly Val Ile Asn Ala Leu Gly Asn Le #u Gly Gly Phe Cys Gly     370               #   375               #   380 Pro Tyr Ala Val Gly Val Leu Ile Thr Leu Ty #r Ser Lys Asp Ala Gly 385                 3 #90                 3 #95                 4 #00 Val Tyr Cys Leu Ala Ile Ser Leu Ala Leu Al #a Ala Leu Met Ala Leu                 405   #               410   #               415 Leu Leu Pro Ala Lys Cys Asp Ala Gly Ala Al #a Pro Val Lys Thr Ile             420       #           425       #           430 Asn Pro His Lys Arg Thr Ala         435 <210> SEQ ID NO 13 <211> LENGTH: 3153 <212> TYPE: DNA <213> ORGANISM: Unknown <220> FEATURE: <223> OTHER INFORMATION: environmental source <221> NAME/KEY: CDS <222> LOCATION: (292)...(1236) <221> NAME/KEY: CDS <222> LOCATION: (1252)...(2280) <221> NAME/KEY: CDS <222> LOCATION: (2293)...(3045) <400> SEQUENCE: 13 catgcctgca ggtcgactct agaggatctc gccgcgcctc aggtcgaggg at #acactcgt     60 cagcgctttc gtgccgccga actccttcga aacggcacga aactccagaa gt #ttgtccgt    120 atccaccccg ctcctcccaa agctttatga ggctatagga tattgatatg gt #atcgataa    180 cactcctgtc aagaggcggt tttcacgcca ggcgggaggg caaaatagga ct #ggacaatt    240 ccttcaagcg ggatatgtta tcgataacaa atcatcttcc ggaggagagc c  #atg agc     297                    #                   #                   #   Met Ser                    #                   #                   #    1 aag atc gat gtg ttg cag gtc ggt ccc tac cc #t gca tgg gac gag gag      345 Lys Ile Asp Val Leu Gln Val Gly Pro Tyr Pr #o Ala Trp Asp Glu Glu          5          #          10         #          15 cgc ctg aac gcg acc ttc acg atg cac cgc ta #t ttc gag gcg gcc gac      393 Arg Leu Asn Ala Thr Phe Thr Met His Arg Ty #r Phe Glu Ala Ala Asp      20              #     25              #     30 aag gcg gcg ttt ctg gcc gag cac ggc ggc ac #g atc cgc ggc atc gcc      441 Lys Ala Ala Phe Leu Ala Glu His Gly Gly Th #r Ile Arg Gly Ile Ala  35                  # 40                  # 45                  # 50 acg cgc ggc gag ctt ggt gcc aac cgg gcg at #g atc gag gcg ctg ccg      489 Thr Arg Gly Glu Leu Gly Ala Asn Arg Ala Me #t Ile Glu Ala Leu Pro                  55  #                 60  #                 65 aag ctg gaa gtg atc tcg gtc tac ggc gtc gg #c ttc gat gcg gtg gac      537 Lys Leu Glu Val Ile Ser Val Tyr Gly Val Gl #y Phe Asp Ala Val Asp              70      #             75      #             80 ctt tcg gcg gcc cgc gag cgc ggc atc cgc gt #c acc aac acg ccc gac      585 Leu Ser Ala Ala Arg Glu Arg Gly Ile Arg Va #l Thr Asn Thr Pro Asp          85          #         90          #         95 gtg ctc acc aag gac gtg gcc gat ctc ggc at #c gcc atg atg ctg gcg      633 Val Leu Thr Lys Asp Val Ala Asp Leu Gly Il #e Ala Met Met Leu Ala     100               #   105               #   110 cag gcg cgc ggc gtc atc ggc gga gag gcc tg #g gtg aag agc ggc gat      681 Gln Ala Arg Gly Val Ile Gly Gly Glu Ala Tr #p Val Lys Ser Gly Asp 115                 1 #20                 1 #25                 1 #30 tgg gca agc aag ggt ctc tat ccg ctg aag cg #c cgc gta cat ggc atg      729 Trp Ala Ser Lys Gly Leu Tyr Pro Leu Lys Ar #g Arg Val His Gly Met                 135   #               140   #               145 cgc gcc ggg gtg ctc ggc ctc ggc cgc atc gg #c tac gag gtg gcc aag      777 Arg Ala Gly Val Leu Gly Leu Gly Arg Ile Gl #y Tyr Glu Val Ala Lys             150       #           155       #           160 cgc ctt gcc ggc ttc gac atg gac atc gcc ta #c agc gac acc ggc ccg      825 Arg Leu Ala Gly Phe Asp Met Asp Ile Ala Ty #r Ser Asp Thr Gly Pro         165           #       170           #       175 aag gat ttc gcc agg gac tgg acc ttc gtc gc #c gat ccg gcg gag ctg      873 Lys Asp Phe Ala Arg Asp Trp Thr Phe Val Al #a Asp Pro Ala Glu Leu     180               #   185               #   190 gcc gcc cgc tcc gac ttc ctc ttc gtc acg ct #c gcc gcc tcc gcc gag      921 Ala Ala Arg Ser Asp Phe Leu Phe Val Thr Le #u Ala Ala Ser Ala Glu 195                 2 #00                 2 #05                 2 #10 acg cgc cac atc gtc ggc cgc aag gtc atc ga #g gcg ctc ggc cct gag      969 Thr Arg His Ile Val Gly Arg Lys Val Ile Gl #u Ala Leu Gly Pro Glu                 215   #               220   #               225 ggc atg ctg atc aac atc tcg cgc gct tcc aa #c atc gat gaa agc gcc     1017 Gly Met Leu Ile Asn Ile Ser Arg Ala Ser As #n Ile Asp Glu Ser Ala             230       #           235       #           240 ctt ctc gac gcg ctg gag acg aag gcg ctc gg #c tcg gcc gcg ctc gac     1065 Leu Leu Asp Ala Leu Glu Thr Lys Ala Leu Gl #y Ser Ala Ala Leu Asp         245           #       250           #       255 gtc ttc gag ggc gag ccg aac ctc aat ccg cg #t ttc ctt gcc ctc gac     1113 Val Phe Glu Gly Glu Pro Asn Leu Asn Pro Ar #g Phe Leu Ala Leu Asp     260               #   265               #   270 aac gtc ctc ttg cag ccg cac atg gcc tcc gg #c acg atc gag acc cgc     1161 Asn Val Leu Leu Gln Pro His Met Ala Ser Gl #y Thr Ile Glu Thr Arg 275                 2 #80                 2 #85                 2 #90 aag gcc atg ggc cag ctc gtc ttc gac aac ct #g tcg gcc cat ttc gac     1209 Lys Ala Met Gly Gln Leu Val Phe Asp Asn Le #u Ser Ala His Phe Asp                 295   #               300   #               305 ggc cgg ccg ctg ccg acc ccg gtt ctg taaggagag #a ggtcc atg aag gcg    1260 Gly Arg Pro Leu Pro Thr Pro Val Leu     #             Met Lys Ala             310       #           315 atc gtc atc cat cag gcc aag gac ctg cgc gt #c gag gac agc gcc gtc     1308 Ile Val Ile His Gln Ala Lys Asp Leu Arg Va #l Glu Asp Ser Ala Val     320               #   325               #   330 gag gcg ccc ggc ccc ggc gag gtg gag atc cg #c ctt gcc gcc ggc ggc     1356 Glu Ala Pro Gly Pro Gly Glu Val Glu Ile Ar #g Leu Ala Ala Gly Gly 335                 3 #40                 3 #45                 3 #50 atc tgc ggc tcg gac ctg cac tac tac aac ca #c ggc ggc ttc ggc acg     1404 Ile Cys Gly Ser Asp Leu His Tyr Tyr Asn Hi #s Gly Gly Phe Gly Thr                 355   #               360   #               365 gtg cgc ctc aag gag ccg atg atc ctc ggc ca #t gag gtt tcc ggc cac     1452 Val Arg Leu Lys Glu Pro Met Ile Leu Gly Hi #s Glu Val Ser Gly His             370       #           375       #           380 gtc gcg gcg ctc ggc gaa ggc gtc tcc ggc ct #t gcc atc ggc gac ctc     1500 Val Ala Ala Leu Gly Glu Gly Val Ser Gly Le #u Ala Ile Gly Asp Leu         385           #       390           #       395 gtc gcc gtc tcg ccc tcg cgg ccc tgc ggg gc #g tgc gac tat tgc ctc     1548 Val Ala Val Ser Pro Ser Arg Pro Cys Gly Al #a Cys Asp Tyr Cys Leu     400               #   405               #   410 aag ggc ttg gcg aac cat tgc ttc aac atg cg #c ttc tac ggc tcg gcc     1596 Lys Gly Leu Ala Asn His Cys Phe Asn Met Ar #g Phe Tyr Gly Ser Ala 415                 4 #20                 4 #25                 4 #30 atg ccc ttc ccg cac atc cag ggc gcg ttc cg #c gag cgg ctg gtc gcc     1644 Met Pro Phe Pro His Ile Gln Gly Ala Phe Ar #g Glu Arg Leu Val Ala                 435   #               440   #               445 aag gcc agc cag tgc gtg aag gct gag ggc ct #t tcg gca ggt gaa gcc     1692 Lys Ala Ser Gln Cys Val Lys Ala Glu Gly Le #u Ser Ala Gly Glu Ala             450       #           455       #           460 gcg atg gcc gag ccg ctc tcc gtc acg ctt ca #c gcc acg cgc cgg gcc     1740 Ala Met Ala Glu Pro Leu Ser Val Thr Leu Hi #s Ala Thr Arg Arg Ala         465           #       470           #       475 ggc gaa atg ctg ggc aag cgc gtg ctc gtc ac #c ggc tgc ggg ccg atc     1788 Gly Glu Met Leu Gly Lys Arg Val Leu Val Th #r Gly Cys Gly Pro Ile     480               #   485               #   490 ggc acc ctg tcg atc ctc gcc gcc cgg cgc gc #c ggc gcg gcg gag atc     1836 Gly Thr Leu Ser Ile Leu Ala Ala Arg Arg Al #a Gly Ala Ala Glu Ile 495                 5 #00                 5 #05                 5 #10 gtc gcc gct gac ctt tcc gag cgt gca ctc gg #c ttt gcc cgc gcc gtc     1884 Val Ala Ala Asp Leu Ser Glu Arg Ala Leu Gl #y Phe Ala Arg Ala Val                 515   #               520   #               525 ggc gcg gac cgc acg gtc aac ctg tcg gaa ga #c cgc gac ggc ctc gtt     1932 Gly Ala Asp Arg Thr Val Asn Leu Ser Glu As #p Arg Asp Gly Leu Val             530       #           535       #           540 ccg ttc agc gag aac aag gga tat ttc gat gt #c ctc tac gaa tgc tcg     1980 Pro Phe Ser Glu Asn Lys Gly Tyr Phe Asp Va #l Leu Tyr Glu Cys Ser         545           #       550           #       555 ggc gcc cag ccg gcg ctg gtt gcc ggc atc ca #g gcc ttg cgc ccg cgc     2028 Gly Ala Gln Pro Ala Leu Val Ala Gly Ile Gl #n Ala Leu Arg Pro Arg     560               #   565               #   570 ggc gtc atc gtc cag ctc ggc ctc ggc ggc ga #g atg agc ctt ccc atg     2076 Gly Val Ile Val Gln Leu Gly Leu Gly Gly Gl #u Met Ser Leu Pro Met 575                 5 #80                 5 #85                 5 #90 atg gcg atc acc gcc aag gaa ctg gac ctg cg #c ggc tcc ttc cgc ttc     2124 Met Ala Ile Thr Ala Lys Glu Leu Asp Leu Ar #g Gly Ser Phe Arg Phe                 595   #               600   #               605 cat gag gaa ttc gcc gtc gcc gtg aag ctg at #g cag ggc ggc ctc atc     2172 His Glu Glu Phe Ala Val Ala Val Lys Leu Me #t Gln Gly Gly Leu Ile             610       #           615       #           620 gac gtg aag ccg ctg atc acc cat act ttg cc #g ctt gcc gat gcg ctt     2220 Asp Val Lys Pro Leu Ile Thr His Thr Leu Pr #o Leu Ala Asp Ala Leu         625           #       630           #       635 cag gcc ttc gag atc gcc tcg gac aag ggg ca #a tcg atg aag act cag     2268 Gln Ala Phe Glu Ile Ala Ser Asp Lys Gly Gl #n Ser Met Lys Thr Gln     640               #   645               #   650 atc gca ttc agt taaggaagag cc atg agc atc cag # ctt ttc gac ctc acg   2319 Ile Ala Phe Ser             #  Met Ser Ile Gln Leu Phe Asp Leu Thr 655                   #            660      #            665 ggc aag cgc gcc ctc gtc acc ggc tcc tcg ca #g ggt atc ggc tat gcg     2367 Gly Lys Arg Ala Leu Val Thr Gly Ser Ser Gl #n Gly Ile Gly Tyr Ala         670           #       675           #       680 ctc gcc aag ggc ctt gcc gcc gcc ggc gcg ga #c atc gtc ctc aac ggc     2415 Leu Ala Lys Gly Leu Ala Ala Ala Gly Ala As #p Ile Val Leu Asn Gly     685               #   690               #   695 cgc gac gcg gcc aag ctg gcg gcc gcg gcg ca #g gaa ctc ggc gca aag     2463 Arg Asp Ala Ala Lys Leu Ala Ala Ala Ala Gl #n Glu Leu Gly Ala Lys 700                 7 #05                 7 #10                 7 #15 cac acg ctc gcc ttc gac gcc acc gac cat gc #c gcc gtg cgc gcg gcc     2511 His Thr Leu Ala Phe Asp Ala Thr Asp His Al #a Ala Val Arg Ala Ala                 720   #               725   #               730 atc gac gcc ttc gag gcg gag gtc ggc ccc at #c gac atc ctc gtc aac     2559 Ile Asp Ala Phe Glu Ala Glu Val Gly Pro Il #e Asp Ile Leu Val Asn             735       #           740       #           745 aat gcc ggc atg cag cac cgc acg ccg ctg ga #g gat ttc ccc gcc gat     2607 Asn Ala Gly Met Gln His Arg Thr Pro Leu Gl #u Asp Phe Pro Ala Asp         750           #       755           #       760 gcc ttc gag cgc atc ctg aag acc aac atc tc #g acg gtc ttc aat gtc     2655 Ala Phe Glu Arg Ile Leu Lys Thr Asn Ile Se #r Thr Val Phe Asn Val     765               #   770               #   775 ggc cag gcc gtc gcg cgc cac atg atc gcg cg #c ggc gcg ggc aag atc     2703 Gly Gln Ala Val Ala Arg His Met Ile Ala Ar #g Gly Ala Gly Lys Ile 780                 7 #85                 7 #90                 7 #95 atc aac atc gcc agc gtg cag acc gcg ctc gc #c cgc ccc ggc atc gcg     2751 Ile Asn Ile Ala Ser Val Gln Thr Ala Leu Al #a Arg Pro Gly Ile Ala                 800   #               805   #               810 ccc tat acc gcc acc aag ggc gcc gtc ggc aa #c ctc acc aag ggc atg     2799 Pro Tyr Thr Ala Thr Lys Gly Ala Val Gly As #n Leu Thr Lys Gly Met             815       #           820       #           825 gcg acc gac tgg gcg aaa tac ggc ctg caa tg #c aac gcc atc gcg ccg     2847 Ala Thr Asp Trp Ala Lys Tyr Gly Leu Gln Cy #s Asn Ala Ile Ala Pro         830           #       835           #       840 ggc tat ttc gac acg ccg ctc aat gcc gcg ct #g gtc gcc gat ccg gcc     2895 Gly Tyr Phe Asp Thr Pro Leu Asn Ala Ala Le #u Val Ala Asp Pro Ala     845               #   850               #   855 ttt tcc gcc tgg ctg gaa aag cgc acg ccg gc #c ggc cgc tgg ggc aag     2943 Phe Ser Ala Trp Leu Glu Lys Arg Thr Pro Al #a Gly Arg Trp Gly Lys 860                 8 #65                 8 #70                 8 #75 gtg gag gag ctg atc ggc gcc tgc atc ttt ct #t tcc tcc gac gct tcc     2991 Val Glu Glu Leu Ile Gly Ala Cys Ile Phe Le #u Ser Ser Asp Ala Ser                 880   #               885   #               890 tcc ttc gtg aac gga cac acg ctc tat gtc ga #c ggc ggc atc acg gcc     3039 Ser Phe Val Asn Gly His Thr Leu Tyr Val As #p Gly Gly Ile Thr Ala             895       #           900       #           905 tcg ctc tgaggacaac aggcgcatcg tcctgatggg cgtcgccggc tg #cggcaagt      3095 Ser Leu ccgccgtcgg cgcggcgctc gccgcgcggc tcggtgcgat ccccgggtac cg #agctcg     3153 <210> SEQ ID NO 14 <211> LENGTH: 315 <212> TYPE: PRT <213> ORGANISM: Unknown <220> FEATURE: <223> OTHER INFORMATION: environmental source <400> SEQUENCE: 14 Met Ser Lys Ile Asp Val Leu Gln Val Gly Pr #o Tyr Pro Ala Trp Asp  1               5   #                10   #                15 Glu Glu Arg Leu Asn Ala Thr Phe Thr Met Hi #s Arg Tyr Phe Glu Ala             20       #            25       #            30 Ala Asp Lys Ala Ala Phe Leu Ala Glu His Gl #y Gly Thr Ile Arg Gly         35           #        40           #        45 Ile Ala Thr Arg Gly Glu Leu Gly Ala Asn Ar #g Ala Met Ile Glu Ala     50               #    55               #    60 Leu Pro Lys Leu Glu Val Ile Ser Val Tyr Gl #y Val Gly Phe Asp Ala 65                   #70                   #75                   #80 Val Asp Leu Ser Ala Ala Arg Glu Arg Gly Il #e Arg Val Thr Asn Thr                 85   #                90   #                95 Pro Asp Val Leu Thr Lys Asp Val Ala Asp Le #u Gly Ile Ala Met Met             100       #           105       #           110 Leu Ala Gln Ala Arg Gly Val Ile Gly Gly Gl #u Ala Trp Val Lys Ser         115           #       120           #       125 Gly Asp Trp Ala Ser Lys Gly Leu Tyr Pro Le #u Lys Arg Arg Val His     130               #   135               #   140 Gly Met Arg Ala Gly Val Leu Gly Leu Gly Ar #g Ile Gly Tyr Glu Val 145                 1 #50                 1 #55                 1 #60 Ala Lys Arg Leu Ala Gly Phe Asp Met Asp Il #e Ala Tyr Ser Asp Thr                 165   #               170   #               175 Gly Pro Lys Asp Phe Ala Arg Asp Trp Thr Ph #e Val Ala Asp Pro Ala             180       #           185       #           190 Glu Leu Ala Ala Arg Ser Asp Phe Leu Phe Va #l Thr Leu Ala Ala Ser         195           #       200           #       205 Ala Glu Thr Arg His Ile Val Gly Arg Lys Va #l Ile Glu Ala Leu Gly     210               #   215               #   220 Pro Glu Gly Met Leu Ile Asn Ile Ser Arg Al #a Ser Asn Ile Asp Glu 225                 2 #30                 2 #35                 2 #40 Ser Ala Leu Leu Asp Ala Leu Glu Thr Lys Al #a Leu Gly Ser Ala Ala                 245   #               250   #               255 Leu Asp Val Phe Glu Gly Glu Pro Asn Leu As #n Pro Arg Phe Leu Ala             260       #           265       #           270 Leu Asp Asn Val Leu Leu Gln Pro His Met Al #a Ser Gly Thr Ile Glu         275           #       280           #       285 Thr Arg Lys Ala Met Gly Gln Leu Val Phe As #p Asn Leu Ser Ala His     290               #   295               #   300 Phe Asp Gly Arg Pro Leu Pro Thr Pro Val Le #u 305                 3 #10                 3 #15 <210> SEQ ID NO 15 <211> LENGTH: 343 <212> TYPE: PRT <213> ORGANISM: Unknown <220> FEATURE: <223> OTHER INFORMATION: environmental source <400> SEQUENCE: 15 Met Lys Ala Ile Val Ile His Gln Ala Lys As #p Leu Arg Val Glu Asp  1               5   #                10   #                15 Ser Ala Val Glu Ala Pro Gly Pro Gly Glu Va #l Glu Ile Arg Leu Ala             20       #            25       #            30 Ala Gly Gly Ile Cys Gly Ser Asp Leu His Ty #r Tyr Asn His Gly Gly         35           #        40           #        45 Phe Gly Thr Val Arg Leu Lys Glu Pro Met Il #e Leu Gly His Glu Val     50               #    55               #    60 Ser Gly His Val Ala Ala Leu Gly Glu Gly Va #l Ser Gly Leu Ala Ile 65                   #70                   #75                   #80 Gly Asp Leu Val Ala Val Ser Pro Ser Arg Pr #o Cys Gly Ala Cys Asp                 85   #                90   #                95 Tyr Cys Leu Lys Gly Leu Ala Asn His Cys Ph #e Asn Met Arg Phe Tyr             100       #           105       #           110 Gly Ser Ala Met Pro Phe Pro His Ile Gln Gl #y Ala Phe Arg Glu Arg         115           #       120           #       125 Leu Val Ala Lys Ala Ser Gln Cys Val Lys Al #a Glu Gly Leu Ser Ala     130               #   135               #   140 Gly Glu Ala Ala Met Ala Glu Pro Leu Ser Va #l Thr Leu His Ala Thr 145                 1 #50                 1 #55                 1 #60 Arg Arg Ala Gly Glu Met Leu Gly Lys Arg Va #l Leu Val Thr Gly Cys                 165   #               170   #               175 Gly Pro Ile Gly Thr Leu Ser Ile Leu Ala Al #a Arg Arg Ala Gly Ala             180       #           185       #           190 Ala Glu Ile Val Ala Ala Asp Leu Ser Glu Ar #g Ala Leu Gly Phe Ala         195           #       200           #       205 Arg Ala Val Gly Ala Asp Arg Thr Val Asn Le #u Ser Glu Asp Arg Asp     210               #   215               #   220 Gly Leu Val Pro Phe Ser Glu Asn Lys Gly Ty #r Phe Asp Val Leu Tyr 225                 2 #30                 2 #35                 2 #40 Glu Cys Ser Gly Ala Gln Pro Ala Leu Val Al #a Gly Ile Gln Ala Leu                 245   #               250   #               255 Arg Pro Arg Gly Val Ile Val Gln Leu Gly Le #u Gly Gly Glu Met Ser             260       #           265       #           270 Leu Pro Met Met Ala Ile Thr Ala Lys Glu Le #u Asp Leu Arg Gly Ser         275           #       280           #       285 Phe Arg Phe His Glu Glu Phe Ala Val Ala Va #l Lys Leu Met Gln Gly     290               #   295               #   300 Gly Leu Ile Asp Val Lys Pro Leu Ile Thr Hi #s Thr Leu Pro Leu Ala 305                 3 #10                 3 #15                 3 #20 Asp Ala Leu Gln Ala Phe Glu Ile Ala Ser As #p Lys Gly Gln Ser Met                 325   #               330   #               335 Lys Thr Gln Ile Ala Phe Ser             340 <210> SEQ ID NO 16 <211> LENGTH: 251 <212> TYPE: PRT <213> ORGANISM: Unknown <220> FEATURE: <223> OTHER INFORMATION: environmental source <400> SEQUENCE: 16 Met Ser Ile Gln Leu Phe Asp Leu Thr Gly Ly #s Arg Ala Leu Val Thr  1               5   #                10   #                15 Gly Ser Ser Gln Gly Ile Gly Tyr Ala Leu Al #a Lys Gly Leu Ala Ala             20       #            25       #            30 Ala Gly Ala Asp Ile Val Leu Asn Gly Arg As #p Ala Ala Lys Leu Ala         35           #        40           #        45 Ala Ala Ala Gln Glu Leu Gly Ala Lys His Th #r Leu Ala Phe Asp Ala     50               #    55               #    60 Thr Asp His Ala Ala Val Arg Ala Ala Ile As #p Ala Phe Glu Ala Glu 65                   #70                   #75                   #80 Val Gly Pro Ile Asp Ile Leu Val Asn Asn Al #a Gly Met Gln His Arg                 85   #                90   #                95 Thr Pro Leu Glu Asp Phe Pro Ala Asp Ala Ph #e Glu Arg Ile Leu Lys             100       #           105       #           110 Thr Asn Ile Ser Thr Val Phe Asn Val Gly Gl #n Ala Val Ala Arg His         115           #       120           #       125 Met Ile Ala Arg Gly Ala Gly Lys Ile Ile As #n Ile Ala Ser Val Gln     130               #   135               #   140 Thr Ala Leu Ala Arg Pro Gly Ile Ala Pro Ty #r Thr Ala Thr Lys Gly 145                 1 #50                 1 #55                 1 #60 Ala Val Gly Asn Leu Thr Lys Gly Met Ala Th #r Asp Trp Ala Lys Tyr                 165   #               170   #               175 Gly Leu Gln Cys Asn Ala Ile Ala Pro Gly Ty #r Phe Asp Thr Pro Leu             180       #           185       #           190 Asn Ala Ala Leu Val Ala Asp Pro Ala Phe Se #r Ala Trp Leu Glu Lys         195           #       200           #       205 Arg Thr Pro Ala Gly Arg Trp Gly Lys Val Gl #u Glu Leu Ile Gly Ala     210               #   215               #   220 Cys Ile Phe Leu Ser Ser Asp Ala Ser Ser Ph #e Val Asn Gly His Thr 225                 2 #30                 2 #35                 2 #40 Leu Tyr Val Asp Gly Gly Ile Thr Ala Ser Le #u                 245   #               250 <210> SEQ ID NO 17 <211> LENGTH: 32 <212> TYPE: DNA <213> ORGANISM: Artificial Sequence <220> FEATURE: <223> OTHER INFORMATION: synthetic construct <400> SEQUENCE: 17 acccaagctt caccaaaaga gtgaagagga ag        #                   #          32 <210> SEQ ID NO 18 <211> LENGTH: 34 <212> TYPE: DNA <213> ORGANISM: Artificial Sequence <220> FEATURE: <223> OTHER INFORMATION: synthetic construct <400> SEQUENCE: 18 cgtatctaga aaaatattct ggtgatgaag gtga        #                   #            34 <210> SEQ ID NO 19 <211> LENGTH: 34 <212> TYPE: DNA <213> ORGANISM: Artificial Sequence <220> FEATURE: <223> OTHER INFORMATION: synthetic construct <400> SEQUENCE: 19 agactctaga tccacataaa cgcactgcgt aaac        #                   #            34 <210> SEQ ID NO 20 <211> LENGTH: 33 <212> TYPE: DNA <213> ORGANISM: Artificial Sequence <220> FEATURE: <223> OTHER INFORMATION: synthetic construct <400> SEQUENCE: 20 gaggggatcc tggcttcgtg aacgatatac tgg        #                   #             33 <210> SEQ ID NO 21 <211> LENGTH: 31 <212> TYPE: DNA <213> ORGANISM: Artificial Sequence <220> FEATURE: <223> OTHER INFORMATION: synthetic construct <400> SEQUENCE: 21 aataggatcc ttcatcacca gaatattttt a         #                   #              31 <210> SEQ ID NO 22 <211> LENGTH: 28 <212> TYPE: DNA <213> ORGANISM: Artificial Sequence <220> FEATURE: <223> OTHER INFORMATION: synthetic construct <400> SEQUENCE: 22 cataggtacc ggctttcaga taggtgcc          #                   #                 28 

What is claimed is:
 1. An isolated nucleic acid molecule comprising the nucleic acid sequence of SEQ ID NO.
 7. 2. An isolated nucleic acid molecule encoding a polypeptide having an amino acid sequence of SEQ ID NO. 8 or an amino acid sequence having at least 60% sequence identity to SEQ ID NO: 8, wherein said polypeptide has 2, 5-diketo-D-gluconlc acid (2,5-DKG) permease activity.
 3. The isolated nucleic acid molecule of claim 2, wherein the nucleic acid molecule encodes a polypeptide having at least 70% sequence identity to SEQ ID NO:
 8. 4. The isolated nucleic acid molecule of claim 2, wherein the nucleic acid molecule encodes a polypeptide having at least 80% sequence identity to SEQ ID NO:
 8. 5. The isolated nucleic acid molecule of claim 2, wherein the nucleic acid molecule; encodes a polypeptide having at least 95% sequence identify to SEQ ID NO:
 8. 6. The isolate nucleic acid molecule of claim 2, wherein the nucleic acid molecule encodes the polypeptide of SEQ ID NO:
 8. 7. An isolated nucleic acid molecule comprising a nucleotide sequence having at least 40% sequence identity to SEQ ID NO: 7, wherein said nucleotide sequence encodes a polypeptide having 2,5-diketo-D-gluconic acid (2,5-DKG) permease activity.
 8. The isolated nucleic acid molecule of claim 7, wherein the nucleotide sequence has at least 80% sequence identity to SEQ ID NO:
 7. 9. The isolated nucleic acid molecule of claim 2 further comprising a promoter operably linked thereto.
 10. The isolated nucleic acid molecule of claim 9, wherein said promoter is a lac promoter.
 11. A vector comprising the nucleic acid molecule of claim
 2. 12. The vector of claim 11 further comprising a spectinomycin resistance gene.
 13. A bacterial host comprising the vector of claim
 11. 14. A bacterial host comprising the nucleic acid molecule of claim
 2. 15. The bacteria host of claim 14, wherein said host lacks endogenous 2, 5-DKG permease activity.
 16. The bacterial host of claim 14, wherein the bacterial host is from the genus Klebsiella.
 17. The bacteria host of claim 16, wherein the Klebsiella is Klebsiella oxytoca.
 18. The bacterial host of claim 14, wherein the bacterial host is from the genus Pantoea.
 19. The bacterial host of claim 18, wherein the bacterial host is Pantoea citrea.
 20. The bacterial host of claim 14 further comprising a polynucleotide encoding a polypeptide having 2-keto reductase activity, said polypeptide having at least 80% amino acid sequence identity to SEQ ID NO:
 14. 21. The bacterial host of claim 14 further comprising a polynucleotide encoding a polypeptide having 5-keto reductase activity, said polypeptide having at least 80% amino acid sequence identity to SEQ ID NO:
 16. 22. An isolated oligonucleotide comprising at least 20 contiguous nucleotides of the nucleotide sequence of SEQ ID NO: 7, wherein said oligonucleotide is used as a probe and hybridizes under stringent hybridization conditions to a nucleic acid that encodes a polypeptide having 2,5-diketo-D-gluconic acid (2,5-DKG) permease activity.
 23. The isolated oligonucleotide of claim 22 comprising at least 50 contiguous nucleotides of the nucleotide sequence of SEQ ID NO:
 7. 24. A method of enhancing the production of 2-keto-L-gulonic acid (2-KLG) in a bacterial host comprising a) transforming a bacterial host with a nucleic acid which encodes a first polypeptide having 2,5-diketo-D-gluconic acid (2,5- DKG) permease activity, said first polypeptide having at least 60% amino acid sequence identity to SEQ ID NO: 8, wherein the bacterial host is capable of expressing an enzyme that catalyzes the conversion of 2,5-DKG to 2-KLG, b) culturing the transformed bacterial host under suitable culture conditions, and c) obtaining 2-KLG.
 25. The method according to claim 24, wherein the amino acid sequence of the first polypeptide having 2,5-DKG permease activity has at least 70% amino acid sequence identity to SEQ ID NO:
 8. 26. The method according to claim 24, wherein the amino acid sequence of the first polypeptide having 2,5-DKG permease activity has at least 80% amino acid sequence identity to SEQ ID NO:
 8. 27. The method according to claim 24, wherein the first polypeptide having 2,5-DKG permease activity has the amino acid sequence of SEQ ID NO:
 8. 28. The method according to claim 24, wherein the bacterial host is from the genus Pantoea.
 29. The method according to claim 24, wherein the bacterial host is E. coli.
 30. A bacterial host obtained according to the method of claim
 24. 31. The method according to claim 24 further comprising transforming the bacterial host with a polynucleotide encoding a second polypeptide, said second polypeptide having at least 80% amino acid sequence identity to SEQ ID NO: 10, wherein said second polypeptide has 2,5-DKG permease activity.
 32. The method according to claim 31, wherein the second polypeptide has at least 95% amino acid sequence identity to SEQ ID NO:
 10. 33. A bacterial host obtained according to the method of claim
 31. 34. The method according to claim 24 further comprising isolating the 2-KLG.
 35. The method according to claim 34 further comprising converting the 2-KLG to ascorbic acid.
 36. The method according to claim 24, wherein the bacterial host further includes a non-functional tkrA gene. 